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CDL Air Brake Practice Test with 100% Correct Answers.
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CDL Air Brake Practice Test with 100% Correct Answers. The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like: a. Fluid pressure b. Spring pressure c. Air pressure d. Any of the above - CORRECT ANSWER b. Spring pressure ...

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  • August 18, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • cdl
  • cdl air brake practice test with 100 correct answ

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CDL Air Brake Practice Test with 100%
Correct Answers.

The parking or emergency brake on a heavy vehicle can only be held in position by something that
cannot leak away, like:



a. Fluid pressure

b. Spring pressure

c. Air pressure

d. Any of the above - CORRECT ANSWER b. Spring pressure



A straight truck or bus air brake system should not leak at a rate of more than __ psi per minute with the
engine off and the brake released.



a. 1

b. 2

c. 3

d. 4 - CORRECT ANSWER c. 3



Your vehicle has dual air brake system. If low air pressure warning comes on for the secondary system or
for one system, you should:



a. Bring the vehicle to a safe stop and continue only when the system is fixed.

b. Reduce your speed, and test the remaining system while under-way.

c. Reduce your speed, and drive to the nearest garage for repairs.

d. Continue at normal speed if only the secondary system fails. - CORRECT ANSWER a. Bring the vehicle
to a safe stop and continue only when the system is fixed.



If your vehicle has an alcohol evaporator, it is there to:

, a. Rid the wet tank of alcohol that condenses and sits at the bottom.

b. Eliminate the need for daily tank draining.

c. Boost tank pressure the same way that superchargers boost engines.

d. Reduce the risk of ice in the air brake valves in cold weather. - CORRECT ANSWER d. Reduce the risk of
ice in the air brake valves in cold weather.



Air braking takes more time than hydraulic because air:



a. Brakes use different brake drums.

b. Takes more time to flow through the lines than hydraulic fluid.

c. Brakes require heavier return springs.

d. Is always leaking through airline fittings. - CORRECT ANSWER b. Takes more time to flow through the
lines than hydraulic fluid.



The brake pedal in an air brake system:



a. Controls the speed of the air compressor.

b. Always needs to be held down halfway during normal driving.

c. Controls the air pressure applied to put on the brakes.

d. Is connected to slack adjusters by a series of rods and linkages. - CORRECT ANSWER c. Controls the air
pressure applied to put on the brakes.



With air brake vehicles, the parking brakes should be used:



a. Whenever you leave the vehicle unattended.

b. To hold your speed when going downhill.

c. As little as possible.

d. Only during pre and post-trip inspections. - CORRECT ANSWER a. Whenever you leave the vehicle
unattended.

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