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203 Cards in this Set
- Front
- Back
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If it takes 50 pounds of force to drag one material across another one, what is the coefficient of friction?
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.50
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On disc brakes, the friction linings are called
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pads
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's law states that 'pressure in an enclosed system is equal and undiminished in all directions.'
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Pascal's law
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What is the DOT number for synthetic brake fluid?
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DOT 5
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What is the term for a material that absorbs water?
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Hydroscopic
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What material is part of brake fluid that is also part of automotive coolant?
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Ethyiene glycol
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When the leading shoe on a drum brake is forced into the brake drum as it rotates, this is called ____
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self-energizing action or self-energization
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The two main kinds of drum brake designs are the duo-servo and the leading-____ shoe.
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trailing Brake shoes
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What do most power brake booster diaphragms use to provide an assist to pedal effort?
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Engine vaccum
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The parking brake must operate independently from the _____ brakes.
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Service
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All of the following statements about drum brake fade are true EXCEPT
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Lining coefficient of friction becomes higher
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Which of the following brake design use(s) return springs?
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Drum brakes
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Which of the following statements is/are true about the front disc brakes?
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They are self-adjusting, the brake fluid level drops as lining wears, when brakes release the seal reacts, pulling the piston back.
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The brake pedal on a disc/drum car becomes higher on the second application. Technician A says that the rear brakes might be in need of adjustment. Tech B says that the front brakes might be in need of adjustment. Who is right?
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Tech A
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Tech A says that when the master cylinder bore size is increased beyond original size, stopping effort becomes less. Tech B says that when wheel cylinder bores are increased beyond orginal size, stopping effort becomes greater. Who is right?
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neither A or B
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Which of the following statements is/are true?
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Pressure equals force divided by area (P=F/A), force equals presure times area (F=P*A).
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All of the following statements about the parking brake are true EXCEPT
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Federal law requires that the parking brakebe able to stop a vehicle in motion.
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Tech A says that the fixed caliper design has a piston or pistons on only one side. Tech B says that the floating caliper design must be able to slide during and after the brake are applied. Who is right?
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Tech B
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Tech A says that tandem brake systems can be split front to rear. Tech B says that tandem brake systems can be split diagonally. Who is right?
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Tech A and B
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Tech A says that sometimes linings are bonded to the metal brake backing. Tech B says that sometimes linings are riveted to the metal brake backing. Who is right?
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Tech A and B
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A soft brake pedal due to air in the system is called a ___ pedal.
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Spongy
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With a vacuum power brake booster, when you apply the brake pedal with the engine off you should hear the sound of ____ entering the booster.
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Air
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What color is silicone brake fluid?
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Purple
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Does alcohol absorb water?
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Yes
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What do you do to a master cylinder before installing it on a car?
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bench bleed
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What is the name of the type of vacuum cleaner filter that is used to clean asbestos?
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hepa
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How much lining-to-drum clearance will there be after brakes are adjusted with a brake adjustment gauge?
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0.010
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What can you use to remove the threaded finish left after machining a brake rotor?
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non-directional finish with sander
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A ____ is useded to push the piston to the bottom of the caliper bore before installing new brake linings.
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c clamp
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A rebuilt brake caliper that includes all of the parts is called a ____ caliper.
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Loaded
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At what percentage of slip does maximum traction occur?
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10-20%
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How fast can a typical ABS pulsate the pressure to the brake system?
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10-20 time per sec
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What is the name of the type of ABS with a conventional power brake and master cylinder that is also called remote or add-on ABS?
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nonintegral
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Whisch ABS can have up to 2,700 psl available at the wheels even when the engine is off?
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Integral
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Changes in the magnetic lines of flux around the wheel speed sensor cause a(n) _____ current voltage.
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alternating current (AC)
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Why do manufacturers enclose wheel speed sensor wiring in braided metal tubing or wind it in twisted pairs?
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Radio frequency interference (RFI)
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What are two names for the wheel speed sensor's toothed ring that spins with the wheel?
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tone ring and exciter ring
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What is the name of the type of high-pressure ABS that can lose its rear brakes and power assist durring an ABS failure?
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Integral
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How many channels does an antilock brake system have when it has seperate hydraulic controls for the front brakes but the rear brakes share a common sensor and solenoids?
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3 channel
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What are the 3 stages of ABS solenoid operation in 3 & 4 channel systems?
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Pressure build up, pressure hold, pressure rodure
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When fluid pressure is released to a wheel, this is called pressure dump or ____.
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Decay
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In most ABS, ____ control the holding and releasing of hydraulic system pressure.
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Pressure release valve
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Which type of ABS uses a motor pack instead of solenoids?
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Integral
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In a traction control system, which can be implemented faster, engine controls or application of the brakes?
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Engine controls
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What is the name of the system that can control understeer and oversteer?
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Traction control
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Tech A says that when the ABS senses a failure, the brake system reverts to conventional braking. Tech B says that during normal operation, the ABS works asw a conventional brake system. Who is right?
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Tech A
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Tech A says that most wheel speed sensors are permanent magent types. Tech B says that some ABS use a Hall-effect wheel speed sensore. Who is right>
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Tech A
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Tech A says that a wheel speed sensor's voltage output does not change with the speed of wheel rotation. Tech B says that a wheel speed sensor's frequency changes with the speed of wheel rotation. Who is right?
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Tech B
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Which of the following is/are locations for a wheel speed sensor tone ring?
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inside the brake drum, in the differential or on the transmission tailshaft, on a CV joint.
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Tech A says that the purose of the ABS is to help avoid loss of steering control when a wheel loses taction. Tech B says that an ABS stop will result in a shorter stopping distance that a stop with normal braking. Who is right?
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Tech A
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The amber (yellow) brake warning light is on. Tech A says that there is an ABS failure and the ABS is deactivated. Tech B says that this can be due to low fluid level in one half of the master cylinder. Who is right?
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Both A and B
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The left front wheel locks up during an ABS stop. Tech A says that is the blocking solenoid for the left front brake is energized, the master cylinder is isolated from the left front wheel cylinder. Tech B says that if the dump solenoid opens, normal braking will be reestablished. Who is right?
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Tech B
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Which of the following could cause a code and illumination of the ABS warning light?
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an ABS solenoid problem, a faulty wheel speed sensor signal, a faulty ABS controld module
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Tech A says that a scan tool is needed to bleed some types of hydraulic control units. Tech B says to use DOT 5 brake fluid with ABS. Who is right?
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Tech A
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In a traction control system, the engine's power output can be controlled by:
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disabling fuel injections, retarding ignition timing, upshifting the transmission.
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What kind of bearing is a ball or roller, antifriction or plain?
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anti-friction
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The seperator that holds roller or ball bearings properly spaced in the bearing assembly is called a ___.
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Cage
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An up-and-down load on a bearing is called a ___ load.
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Radial
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The front-to-rear or side-to-side load on a bearing is called a ___ load.
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Thrust
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Which bearing design has greater load carrying capacity, roller or ball?
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Roller
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A ___ bearing is a very small roller bearing.
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Needle
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What kind of soap would probably be used as a thickening agent for wheel bearing grease?
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Sodium
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If a grease has a lower NLGI number, is it thicker or softer?
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Softer
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What is the term used for the temperature at which the grease turns into a liquid?
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Drop point
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Which grease would be intended for use in wheel bearings, L or G?
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G
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Which kind of oil can be damaging to a nitrile seal?
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Lithium
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How much running clearance would a correctly adjusted tapered roller front wheel bearing have?
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0.001-0.005"
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What is it called when a bearing or race has indentations from shock loads?
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"brinelling
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On a race car, how far should the wheel bearing hub cavity be filled with grease?
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25% (quater of the way)
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2 techs are discussing RWD tapered front wheel bearings. Tech A says that the outside wheel bearings supports the load of the vehicle. Tech B says that the inside bearing holds the wheel in alignment. Who is right?
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Neither A or B
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Tech A says that roller bearings can support a greater load than ball bearings. Tech B says that most of a vehicle's load is exerted on the bottom of a roller bearing. Who is right?
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Tech A
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Which of the following is/are true about tapered roller bearings?
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They have lips on the inner and outer edges on the inner race only, they control end thrust, and they are self aligning.
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Tecvh A says that axle bearing is the term for those bearings found on non-drive front and rear wheels. Tech B says that wheel bearing is the term for those bearings found on live axles. Who is right?
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Neither A or b
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All of the following statements are true about axles EXCEPT:
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if an axle breaks on a semi-floating axle, the rear brake drum and wheel will still be supported.
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Tech A says that grease is made up mostly of lubricating oil. Tech B says that soaps are what make grease thick. Who is right?
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Both A and B
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Which of the following is/are true about lip seals?
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The open side of a lip seal always faces toward the lubricant.
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Tech A says that during a bearing repack, the hub cavity should be completely filled with grease. Tech B says that a wheel bearing fits the spindle tighly and should be tapped into place with a brass punch. Who is right?
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Tech B
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Which of the following is/are true about cotter pins?
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When swelecting a new cotter pin, use the largest diameter one that will fit into the hole.
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Tech A says that the rate of oil of grease oxidation doubles with every 20 degree F increase in temperature. Tech B says that the dropping point is the highest temperature at which a grease can be safely used. Who is right?
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Tech A
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What is it called when water forms a wedge under the tire, causing it to lose traction?
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Hydroplaning or aquaplaning
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Which tire allows better fuel economy, radial or bias?
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Radial
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What is the area of tread contact called?
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Footprint
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What is another name for a tire's height?
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Profile
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What is the miles-per-hour limit for a speed rating of H?
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130 mph
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What are the two letters that are found on snow or all-season tires?
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M & S
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When changing a tire sized 195/75 R15 to a 5% lower profile, the correct tire size would be ____.
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205/70 R15
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What is the lower area between the bead seats of a wheel rim called?
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Drop center
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When a wheel is offset to increase the track width of the front tires, this is called ____.
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Negative wheel affect
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A small leak of one bubble per minute can result in the loss of ____ psi per month.
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1.5 psi per month
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Tech A says that a tire with a tread wear rating of 200 would be expected to last twice as long under the same conditions as one with a 100 rating. Tech B says that when the diameter of a tire is changed, front-end geometry is altered. Who is right?
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Both A and B
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Which of the following is/are true about custom wheels?
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An alloy wheel is made of two or more metals combined to make one.
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Tech A says that the DOT code identifies the manufacturer and country where the tire was made. Tech B says the the DOT code provides the week and year the tire was made. Who is right?
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Both A and B
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All of the following are true about winter tires EXCEPT
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M&S tires guarantee winter driving performance and safety.
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Which of the following is/are true about direct tire pressure monitoring?
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it uses individual wheel sensors, integral sensors are a part of the valve stem, and pressure that is too low or too high will illuminate a warning light.
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2 techs are discussing plus sizing. Tech A says that when a lower profile tire is installed, a wider tire and larder diameter wheel are used. Tech B says that the same overall diameter of the tire and wheel assembly is achieved. Who is right?
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Both A and B
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TIres of a different size than OE have been installed on a vehicle. This can cause:
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the ABS light to come on and the speedometer to be off
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Tech A says that a 70 is a lower profile tire than a 75. Tech B says that an H rating is for higher speeds than a Z rating. Who is right?
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Tech A
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Which of the following is/are true about unidirectional tires?
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They allow faster vehicle acceleration and they allow faster stopping.
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Tech A says that the P in a P-metric radial's size means performance. Tech B says that European tires do not display a P at the front of their tire rating. Who is right?
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Tech B
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What kind of the tire has a bulging sidewall when properly inflated, radial or bias?
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Radial
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About how much does pressure in a tire increase as the tire warms up?
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Change in outside temp of 10 degrees F will result in about 1 psi change in pressure.
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Wear bars show up around the tire tread at what tread depth?
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1/16" (2/32")
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What is the name for the up and down action of the tire that results in scalloped tire wear?
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Wheel tramp
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What is applied to the tire bead before installing a tire on a rim?
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Rubber lube
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Should the valve core be in the valve stem or out of it when filling the tire with air to seat the bead?
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Out
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What kind of hole can be repaired using only a patch?
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Pin hole
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A hole in the tire tread area of a steel-belted tire must be ____ or _____ before installing a plug in it.
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Drilled or reamed
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What kind of tool is used to clean the inside of a tire liner before installing a patch?
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scraper, rubber cleaning solvent
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What type of wheel balance is measured with wheel stationary?
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Static
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If a 15" wheel is 1 oz out of balance, when the wheel rotates at 60 mph, the pounding force will be ____ lbs.
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4.6 pounds
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How fast is the part of the tire that is contacting the ground traveling?
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0 mph
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When a tire is lopsided, with more weight on one side than the other, what kind of imbalance results?
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couple imbalance
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What is the combination of both static and couple imbalance called?
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dynamic balance
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To mount ___ centric wheels, use a special lug-centering adapter.
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Lug
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Which of the following is/are true about wheel balancing?
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When static-balancing a wheel, it is better to place a weight on the inside of the wheel and tire balance problems become less as speed increases.
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Tech A says that a computer tire balancer balances the tire statically. Tech B says that the computer tire balancer balances a tire dynamically. Who is right?
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Both A and B
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Tech A says that wheel lugs on most cars are loosened by turning them clockwise. Tech B says that lug nuts are installed with the tapered side away from the rim. Who is right?
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Neither A or B
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Tech A says that a tire's inflation pressure drops as the car is driven. Tech B says that tire pressure should be checked when the tire is hot. Who is right?
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Tech A
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Which of the following is/are true about tire pressure?
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a tire typically loses pressure of about 1 psi per month and changes in outside temp can have a dangerous effect on tire pressure.
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When rotating tires:
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cross the front tires to the rear on rear-wheel drive vehicles.
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When mounting tires on a tire changer, which of the following is/are true?
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be sure that a valve stem tire pressure monitor is rotated 90 degrees from the bead breaker and if the tire has match mount marking, rotate on the rim to align the colore dot with the valve stem before inflating the tire.
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Tech A says that the part of the tire that is in contact with the ground is traveling at the same speed as the car. Tech B says that the combination of static and couple balance is called dynamic balance. Who is right?
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Both A and B
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Tech A says that not to inflate a tire over 25 lbs when seating a bead. Tech B says that if a hot tire has a lower pressure than the recommended cold pressure, it is seriously underinflated. Who is right?
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Tech A
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Tech A says that the valve core should be installed before inflating a tire to seat its beads. Tech B says that to unseat the tire beads while the tire is inflated. Who is right?
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Neither A or B
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Which kind of spring is adjustable?
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Air springs
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What is the name of the suspension type that used two different length control arms?
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SLA short and long arm suspension (double wish bone)
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What is the name for the part that is used to control oscillations of the sping?
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Shock absorbers
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Hydraullic shock absorbers are sensitive to velocity or load.
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Velocity
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Which shock absorber motion controls the least amount of weight, compression or rebound?
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Rebound
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What is the term that describes the softness or harshness of the ride?
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Shock absorber control force
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What kind of shock can be mounted upside down?
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monotube gas shock absorbers
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If a small amount of air is not kept in an air shock, what can happen?
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fold into shock and become torn
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What is the name of the kind of front suspension that has a built in shock absorber and only ball joint?
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Mac phenrson strut
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What is the name of the ball joint design that is always trying to pull apart?
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Tension type
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When one wheel of a vehicle goes into a pothole and the wheel on the other side of the vehicle moves too, the suspension system is:
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a rigid axle suspension
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Which of the following is/are true about Macpherson strut suspension?
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The ball joint is a follower and it typically has only one control arm
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A typical shock absorber will:
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extend easier than it compresses
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Two techs are discussing gas shocks. Tech A says that gas under pressure prevents oil from foaming. Tech B says that gas under pressure prevents cavitation of the fluid. Who is right?
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Both A and B
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Tech A says that shock absorbers are designed to carry the weight of the vehicle. Tech B says that shock absorbers dampen spring oscillations. Who is right?
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Tech B
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Tech A says that the Macpherson strut provides a better ride and handling than the SLA. Tech B says that a Macpherson strut suspension is often called a double wishbone suspension. Who is right?
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Neither A or B
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Tech A says that some types of ball joints carry a load and others do not. Tech B says that a load carrying ball joint on an SLA suspension is on the control arm that has the spring attached to it. Who is right?
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Both A and B
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All of the following are true about unsprung weight EXCEPT
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the engine is unsprung weight
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Tech A says that independent suspsions with more than two control arms are called miltiling suspensions. Tech B says that "dive" is when the front of the vehilce lifts and the rear lowers during hard acceleration. Who is right?
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Tech A
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Tech A says that shock absorber rebound damper controls the lighter weight of unsprung weight. Tech B says that a car that floats as it travels down the road has a shock absorber rebound control problem. Who is right?
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Tech B
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A ___ shock expands to its full travel when not installed.
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Gas
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What is added when installing a Macpherson strut cartridge to help it conduct heat to the outside of the strut?
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Light weight oil
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If a wheel bearing burns and damages the spindle, what part should be replaced?
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Both, spindle and bearing
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Are there any holes in a good ball joint boot?
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yes, grease relief part
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What are two directions ball joints are checked for wear?
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axial and radial
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Which kind of ball joint is more common, tension or compression?
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Tension
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When a wear indicator ball joint wears, does the shoulder move into or out of the ball joint?
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into
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When a replacement ball joint that is held in place with nuts and bolts, what held the previous ball joint in position?
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Riveted
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What is used with a spring compressor to aid in the removal and replacement of coil springs?
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Clips
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What is the name of the end of a coil spring that aligns in the coil spring seat in the frame or lower control arm?
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Dominent end (square end)
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Tech A says that it is normal for a small amount of moisture to be on the outside of a shock absorber. Tech B says that if the outside of the shock body is damanged, replace it along with the other side of the car. Who is right?
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Both A and B
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Which of the following is/are true about shock absorder rubber mounts?
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When tightening a nut on the top of a shock rod, the rod must be held from turning.
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When replacing stabilizer link bushings, which of the following statements is/are true?
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both front wheels can be on the ground and both front wheels can be off the ground
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Tech A says that a load carrying ball joint must be unloaded to test it. Tech B says that load carrying ball joints must be replaced if there is any perceptible movement. Who is right?
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Tech A
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Which of the following is/are true statements?
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when checking ball joints for wear, applying the brakes will temporarily eliminate wheel bearing clearance, spring sag can result in abnormal tire wear
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When jacking on a control arm to compress a coil spring, the jack should be positioned:
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perpendicular (90 degrees)to the tires
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Tech A says to align the cotter pin hole in a ball joint so it is parallel to the brake backing plate. Tech B says that after tightening to the correct torque specification, loosen the ball joint locknut to align the cotter pin hole. Who is right?
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Tech A
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Which of the following is/are true about shock absorbers?
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cupped tire wear could result from a bad shock absorber
the sound of the fluid being forced through air shocks are designed to raise a vehicles height |
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A Macpherson strut shock absorber is leaking badly. Tech A says that sometimes an entire strut assembly must be replaced. Tech B says that some behicles use a strut cartridge installed into the original shock housing. Who is right?
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Both A and B
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Which of the following is/are true about worn suspension bushings?
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Worn busings can change alignment settings
the car can pull to one side when braking the car can pull to one side all the time |
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One of the two most common types of automotive steering gears is the reciculating ball and nut. What is the name of the other one?
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Rack and pinion steering
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What is the term that compares the number of teeth on the driving gear to the number of teeth on the driven gear?
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Steering ratio
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When the steering wheel is truned all the way in one direction, it stops against a ____.
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Lock
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What is the name of the steering part that is angled so that the front wheels toe out during a turn?
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Steering arm
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What is another type of steering shaft coupling besides a flex coupling?
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Universal joint
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What are the names of the three main types of steering pumps that have been used on automobiles?
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Roller, vane, slipper types
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Which is the most common type of power steering pump design?
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Vane type
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What is the name of the power steering design that has the power steering compnents within the steering gear?
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Integral power steering
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What is the name of the power steering design that uses a standard gear box with a piston attached to the steering linkage?
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Linkage type (power piston)
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What type of power steering is used on hybrid vehicles?
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electric power steering
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Front tire are supposed to toe ____ during a turn.
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Outward
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Tech A says that steering assist is needed most when the car is stopped or nearly stopped. Tech B says that the power steering must be able to provide more steering assist at low engine rpm and idle. Who is right?
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Both A and B
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2 techs are comparing rack-and-pinion steering to recirculating ball steering. Tech A says that recirculating ball steering is more easily damaged when a wheel hits a rock. Tech B says that reciruclating ball steering gears are mounted on rubber bushings to help cushion shocks. Who is right?
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Neither A or B
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All of the following are true about steering columns EXCEPT:
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the steering shaft is held in position in the steering column by a bearing at the top and a rag joint or universal joint at the bottom
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Which of the following is/aren true about electric motor power steering?
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they are rack-and-pinion steering gears
the motor can be located in the passanger compartment |
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The steering design used with short and long arm suspension is the:
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recirculating ball and nut
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A "fast" steering ratio is about ____ turns lock to lock.
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3
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In the figure shown, the part indicated by the arrow is a(n):
*see page 1160* |
Idler arm
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An electronically controlled power steering system:
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increases assist at lower vehicle speeds
decreases as vehicle speed increases |
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What happens to power steering temperature when the wheel is turned several times?
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Hot
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What is the name of the test for looseness where the assistant turns the wheel from side to side with the tires on the ground?
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Dry park check (test)
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How much looseness should there be between a rack and pinion inner tie stud and housing?
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There should not be any looseness between a rack and pinion inner tie-stud and housing
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What is used to remove a pitman arm from a steering gear?
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Pitman arm puller
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What measuring tool is used to make an approximate toe setting when replacing a tie-rod end?
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tape measure
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What is another name for the spiral cable that sends an electric signal from the steering column to the steering wheel?
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Clock spring
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What can happen if the clock spring is not centered before steering linkage is reconnected to a steering gear?
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You will break it
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What is name of the point in a steering gear where the gear teeth come closer together when the car is traveling straight ahead?
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High point
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Which kind of power steering system is more prone to problems, rack and pinion or conventional?
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Rack and pinion
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What is called when there is a loss of steering power assist on cold startups?
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Morning Sickness
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Tech A says that automatic transmission fluid can be used in all power steering systems. Tech B says that the engine must be running when checking steering looseness with a dry park check on a power steering vehicle. Who is right?
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Tech B
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Tech A says that a loose belt can cause the steering wheel to jerk during a turn. Tech B says that a loose steering pump belt is more likely to squeal when driving straight. Who is right?
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Tech A
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Which of the following is/are true about a vehicle that has been driven for a long time with a loose belt?
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the belt has probably become glazed
the pulley groove could be worn out |
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Tech A says that when testing looseness on a rack and pinion tie-rod, the wheels should be hanging free. Tech B says that inner and outer parallelogram tie-rod ends are identical. Who is right?
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Neither A or B
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Tech A says that if the steering wheel is off-center when driving on the highway, removing the steering wheel useing a special puller and replace it in the straight-ahead position. Tech B says that when removing a steering wheel, loosen the nut and then pound on the end of the shaft until the wheel pops loose. Who is right?
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Neither A or B
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Tech A says to store an air bag face down on a workbench. Tech b says that the air bag connector wiring must be disconnected before removing an air bag. Who is right?
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Tech B
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Which of the following is/are true about rack and pinion steering?
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The center of the rack and pinion steering rack is hardened
if a rack is not centered, the vehicle can steer further to one side thaan to the other. |
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Which type of steering gear must be centered so the steering response is not faster in one direction than the other?
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BOTH recirculating ball and nut
rack and pinion |
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If the ends of the idler arm and pitman arm are not at equal height:
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Bump steer will result
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Which power steering hose has a hose clamp on its connection to the pump?
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the return hose
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