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104 Cards in this Set
- Front
- Back
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A tire is worn excessively on both sides. The most likely cause of this type of wear is... |
Underinflation |
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When seating a bead of a tire, never exceed.... |
40 psi |
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For best tire life, most vehicle and tire manufacturers recommend tire rotation every.... |
12000 miles |
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What lubricant should be used when mounting a tire? |
Water based soap |
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Using the modified x-method of tire rotation on a front wheel drive vehicle, where should the left front wheel be placed? |
Left rear |
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T/F: excessive radial runout can cause a tramp-type vibration |
True |
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T/F: excessive lateral runout can cause a tramp-type vibration |
False |
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T/F: a tire out of balance dynamically can cause a shimmy vibration |
True |
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T/F: a tire out of balance statically can cause a tramp vibration |
True |
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The recommended type of wheel weight to use on an aluminum (alloy) wheel is.... |
Coated (painted) or stick-on lead weights |
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Most vehicle and tire manufacturers recommend no more than ____ ounces of balance weight be added to a wheel |
5.5 ounces |
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A vehicle vibrates at highway speed. Tech A says that water in the tires could be the cause. Tech B says that an out of round tire could be that cause. Who? |
Both |
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Proper tire inflation pressure information can be found.... |
On the driver side's door, in the owners manual |
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The part of a tire that is just under the tread of a radial tire is called the.... |
Belt |
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The aspect ratio of a tire means.... |
The ratio of height to width |
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A tire is labeled 215/60R x 15 92T. The t indicates: |
It's speed rating |
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Tire labeled 215/60R x 15 92T. 92 stands for... |
Load rating |
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Radial tires can cause a vehicle to pull to one side while driving. This is called a "radial tire pull" and is often due to... |
Tire conicity |
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Tire inflation is very important to the safe and economical operation of any vehicle. Tech A says the pressure should never exceed the max pressure imprinted on the sidewall. Tech B says to inflate tires to the pressures recommended on the tire info decal or placard on the driver's door. Who? |
Tech B only |
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When purchasing replacement tires, do not change tire width from stock size by more than _____ |
10 mm |
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What do the letters JJ mean in a wheel designation size label 14 x 7JJ? |
The shape of the flange area |
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Tech A says PAX run-flat tires use a special wheel. Tech B says that a standard tire can be used to replace a run-flat. Who? |
A only |
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Wheel back spacing is also called... |
Rear spacing |
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A tire with lower than specified inflation could lead to... |
Reduced fuel economy, reduced tire life, increased chance of roadside faults or accidents |
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Which tire inflation info should be checked to determine the proper tire inflation pressure? |
Cold placard inflation pressure |
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Two techs are discussing tire pressure and temperature. Tech a says that tire pressure will drop 1 psi for every 10 degree drop in temp. Tech B says that the tire pressure will increase as the vehicle is being driven. Who? |
Both |
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Two techs are discussing indirect tire pressure monitoring system. Tech a says it was used by some vehicles manufacturers on vehicle before the 2008 model year. Tech B says it uses the speeds of the LF and RR tires to detect a low tire. Who? |
Both |
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The FMVSS 138 law requires that the driver be notified if the tire inflation pressure drops how much? |
25% |
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The two basic types of direct tpms sensors include.... |
Stem mounted and banded |
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What mode does a direct pressure sensor enter when the vehicle is stopped? |
Sleep mode |
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To activate or learn a direct pressure sensor what does the service tech need to do? |
Enter learn mode and use a magnet OR enter learn mode and decrease tire pressure OR use a handheld tester depending on the system |
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What does the "Delta pressure method" mean? |
Change inflation pressure |
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What type of valve is used in stem mounted sensors? |
Aluminum |
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Which type of automotive bearing can withstand radial and thrust loads, yet must be adjusted for proper clearance? |
Tapered roller bearing |
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Most sealed bearings used in the front wheels of front wheel drive vehicle are usually what type? |
Double row ball bearing |
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On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. This type of bearing failure is called.... |
Brinelling |
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The bearing grease most often specified is rated NLGI #.... |
2 |
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A non drive wheel bearing adjustment procedure includes a final spindle nut tightening torque of... |
Finger tight |
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After a non drive wheel bearing has been properly adjusted, the wheel should have how much end play? |
0.001 to 0.005 inch |
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The differential cover must be removed before removing the rear axle on what type of axle? |
C-lock |
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What parts should be replaced when servicing a wheel bearing on a non drive vehicle? |
The grease seal and the cotter key. |
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Tech A says a defective wheel or axle bearing often makes a growling or rumbling noise. Tech B says that a defective wheel or axle bearing often makes a noise similar to a tire with an aggressive mud or snow design. Who? |
Both |
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Two techs are discussion differentials. Tech A says all differentials are vented. Tech B says that a clogged vent can cause the rear axle seal to leak. Who? |
Both |
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Disc brakes use replaceable friction material called... |
Pads |
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Drum brakes use replaceable friction material called... |
Shoes |
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Tech A says that a power assisted brake reduces stopping distance compared to a Jon power assisted brake system. Tech B says that a power assisted brake system reduces the force that the driver must exert on the brake pedal. Who? |
B only |
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a locked wheel has ______ traction to the road surface than a rolling wheel |
Less |
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Tech A says all vehicles equipped with abs experience pulsating brake pedal even during normal braking. Tech B says that abs will result in quicker stops on all road surfaces. Who? |
B, supposedly. |
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The FMVSS 135 standards determine.... |
The performance of the braking system |
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An owner of a vehicle equipped with ABS brakes complained that whenever he tried to stop on an icy or slippery road, the brake pedal would pulse up and down rapidly. Tech A says that this is normal. Tech B says the ABS unit is malfunctioning. Who? |
A |
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Electric adjustable pedals operate... |
Both accelerator and brake pedal |
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All of the following are specified by FMVSS 135 except: |
Brake noise levels |
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What is the purpose of any brake repair? |
Restore like-new performance |
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T/F: kinetic energy of a vehicle is doubled when the speed doubles |
False: quadrupled |
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T/F: if vehicle weight is doubled, kinetic energy of moving vehicle is doubled |
True |
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Tech A says front brakes do most of the braking because front brakes are larger. Tech B says that due to weight transfer, most of the braking force needs to be done in front. Who? |
Both |
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The brake pedal assembly uses a mechanical lever to... |
Increase the driver's force on the brake pedal applied to master cylinder |
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The friction between two surfaces is effected by all except... |
Heat |
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Tech A says the thicker or heavier disc brake rotor, the more heat can be absorbed. Tech B says that the faster the vehicle is traveling when the brakes are applied, the greater amount of heat created in the brake system. Which technician is correct? |
Both |
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All of the following are examples of brake fade except... |
Gas fade |
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Brake fade caused by water can occur... |
Only if the vehicle is driven in water above the centerline of the axle |
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What can the driver do to reduce the possibility of brake fade? |
Select a lower transmission gear |
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Maximum deceleration rates for a typical passenger car or light truck range from.... |
16 to 32 ft/sec |
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Disc brake pads can reach temps as high as.... |
1300 F |
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Two techs are discussing master cylinders. Tech A says that it is normal to see fluid movement in the reservoir when the brake is applied. Tech B says a defective master cylinder can cause the brake pedal to slowly wonky to the floor when depressed. Who? |
Both |
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If the brake pedal liknage is not adjusted correctly, brake fluid may no be able to expand back into the reservoir through the _____ port of the master cylinder when the brakes get hot. |
Vent port |
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The primary brake circuit fails due to a leak in the lines, leaving the rear section of a dual split master cylinder. Tech A says that the driver will notice a lower than normal brake pedal and some reduced braking power. Tech B says the brake pedal will "grab" higher than normal. Who? |
A only |
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Two techs are discussing a problem where the brake pedal travels too far before the vehicle starts to slow. Tech A says that the brakes may be out of adjustment. Tech B says that one circuit from the master cylinder may be leaking or defective. Who? |
Both |
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Air in the lines will cause what type of problem? |
Low spongy brake pedal |
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The master cylinder is able to move about how much brake fluid during each brake application? |
One teaspoon |
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Brake fluid pressure is measured in what unit? |
Psi |
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How much brake fluid is in a typical master cylinder reservoir? |
Enough to allow all brakes to become completely worn |
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What part in the master cylinder helps keep air from contacting the brake fluid yet allows the fluid level to drop as the disc brakes wear? |
Rubber diaphragm or floating disc |
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The brakes on a vehicle work okay for a while, then the vehicle slows because the brakes self applied. Tech A says that an overfilled master cylinder could be the cause. Tech B says that a blocked vent port could be the cause. Who? |
Both |
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Tech A says a pull during braking could be caused by a defective metering valve. Tech B says a pull during braking could be caused by a defective proportioning valve. Who? |
Neither |
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The rear brakes lock up during normal braking. Tech A says the metering valve could be the cause. Tech B says that a stuck front disc brake caliper could be the cause. Who? |
B only |
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The rear wheels lock during hard braking. Tech A says that a defective metering valve could be the cause. Tech B says that a defective proportioning valve could be the cause. Who? |
B only |
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A defective metering valve may cause _____ wheel locking |
Front |
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A defective proportioning valve could cause ________ wheel locking |
Rear |
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A combination valve could include... |
Metering and proportioning, or proportioning and pressure differential, or all three, depending on the make model |
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A residual check valve is used to... |
Maintain a slight pressure on the hydronic system |
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Tech A says that a red brake light could be turned on if a difference in pressure is detected by the pressure differential switch. Tech B says it could be turned on if the brake fluid level is low. Who? |
Both |
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Which type of vehicle most often do not use metering valves? |
Front wheel drive |
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Tech a says some proportioning valves are one part for both brakes. Tech B says that some proportioning valves are two parts: one for each rear wheel brake. Who? |
Both |
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The button on the _____ valve should be held when bleeding the brakes |
Metering |
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A typical brake light is electrically |
Open |
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The type of brake fluid most often recced by vehicle man is... |
Dot 3 |
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T/F: brake fluid lasts the life of the vehicle unless there is a leak |
False |
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Tech a says dot 5 brake fluid can be mixed with dot 3. Tech B says it's better to but brake fluid in a metal container. Who? |
B only |
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As brake fluid ages, what happens? |
The boiling point decreases |
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Tech a says glycol-based brake fluid causes seals to swell slightly. Tech B says dot 5 brake fluid causes rubber seals to swell. Who? |
A only |
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The two types of flares used on brake lines are... |
Double flared and ISO (bubble) |
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Why are brake lines coiled near the master cylinder? |
To prevent cracking caused by vibrations |
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Flexible brake hosing should be inspected for |
Cracks, leaking And twisting |
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Why should calipers be supported by a wire during service? |
To prevent damage to the hose |
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Used brake fluid should be |
Disposed of properly according to state and local laws |
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The brake bleeding procedure usually specified for a rear wheeled vehicles with dual split master cylinder is... |
RR, LR, RF, LF |
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T/F: the front of the master cylinder should be bled first |
True |
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T/F: a shock is usually needed to loosen a bleeder valve |
True |
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T/F: the brake pedal should be pumped rapidly while bleeding brake lines of air |
False; slow steady pressure only |
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Vacuum is applied where dueing the vacuum bleeding? |
At the wheel brake bleeder valve |
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The usual maximum pressure that should be used to pressure bleed a system is.... |
30 psi |
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How does a bleeder valve seal? |
Tapered ends |
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T/F: air in the hydraulic brake system can cause a hard pedal |
False |
