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25 Cards in this Set
- Front
- Back
The use of air brakes on a downgrade is only a supplement to the:
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Braking effect of the engine
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Your truck has properly functioning dual air brake system an minimum size air tanks. The air pressure should build from 85-100 psi within...... Seconds
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45
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If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
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Release the spring emergency parking brakes to move a short distance
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The proper method of breaking wind going down and/or steep grades after selecting the proper gear is to break until your speed is about.....Miles per hour below your safe speed and then release your breaks
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5
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It is not safe to drive a vehicle that has brake drums or disk with cracks or that are thinner than the manufacturers specifications, generally this will be.....inch
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1/4
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The air brake system for a straight truck or bus should not leak at a rate more then.....psi permanent with the engine off and the brakes released
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2
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The braking power of the spring breaks:
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Depends on the service breaks being in adjustment
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If your truck has dual air brake system and one of the systems is low on pressure:
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Either the front or rear brakes will not be fully operational
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The parking or emergency brakes of trucks and buses can legally be held on by......pressure
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Spring
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Modern airbrake systems are three different systems combined together. They are the service, parking, and....brakes
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Emergency
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That air supply pressure and gauge shows how much pressure:
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Is in the air tanks
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If you must make an emergency stop, brake so you:
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Can steer and your vehicle stays in a straight line
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If your vehicle has an alcohol evaporator, it is there to:
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Reduce the risk of ice and airbrake valves in cold-weather
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The airbrake like distance at 55 mph on dry pavement adds about.....feet to your stopping distance
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32
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The spring breaks use on tractors and straight trucks will bring your truck to a stop when the air pressure drops below.....psi
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20
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A supply pressure gauge tells you how much pressure is in the:
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Air tanks
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When you apply the brakes, the brake shoes/linings are pressed against the:
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Brake drums
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Air braking takes more time than hydraulic breaking because air:
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Takes more time to flow through the lines then hydraulic fluid
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During normal driving, spring breaks are usually held back by:
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Air pressure
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Some airbrakes have a alcohol evaporator. What may happen if you don't keep the unit filled with alcohol
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Ice may form in the air storage tanks and cause brakes to fall
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The brake system that applies and releases the brakes when the driver uses the brake pedal is the....brake system
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Service
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In airbrake vehicles, the parking brakes should be used:
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Anytime the vehicle is parked
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Excessive heat in the brakes can cause the:
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Breaks to fade or fall
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To test air Service breaks you should:
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Break firmly when slowly moving forwards
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You should know your brakes are fading when:
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You have to push the brake pedal harder to control speed on a downgrade
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