NY CDL AIR BRAKES PRACTICE TEST
6.
The tractor protection valve:
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will close if you apply the parking brakes.
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provides the air supply for the brake system.
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will close automatically if the air pressure drops to a certain level.
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All of the above.
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7.
Which of the following is a reason why air tanks must be drained?
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Your transmission fluid may drain out.
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The governor may stop the compressor from pumping air.
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Your brakes may fail due to the water freezing.
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Your battery fluid may drain out.
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8.
Older trailers do not have spring brakes. If the air supply leaks away:
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the trailer will stop normally.
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there will be no emergency brakes.
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the ABS won't work properly.
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All of the above.
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9.
To check the slack adjusters:
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Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
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park downhill and see if the vehicle rolls.
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check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
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None of the above.
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10.
How do you test hydraulic brakes for leaks?
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Pump the brake pedal three times, then apply firm pressure to the pedal and hold for five seconds. The pedal should not move.
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Pull forward against parking brake to make sure the hydraulic brakes holds.
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Pump the brake pedal ten times and see if it holds.
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None of the above.
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