CDL Air Brakes Test | Actual Questions with
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100% Correct Answers | Latest 2025/2026. i,- i,- i,- i,- i,-
Air braking takes more time than hydraulic because air:
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a. Brakes use different brake drums.
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b. Takes more time to flow through the lines than hydraulic fluid.
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c. Brakes require heavier return springs.
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d. Is always leaking through airline fittings.
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time to flow through the lines than hydraulic fluid.
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The brake pedal in an air brake system:
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a. Controls the speed of the air compressor.
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b. Always needs to be held down halfway during normal driving.
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c. Controls the air pressure applied to put on the brakes.
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d. Is connected to slack adjusters by a series of rods and linkages.
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i,- c. Controls the air pressure applied to put on the brakes.
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With air brake vehicles, the parking brakes should be used:
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,a. Whenever you leave the vehicle unattended.
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b. To hold your speed when going downhill.
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c. As little as possible.
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d. Only during pre and post-trip inspections.
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you leave the vehicle unattended.
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For emergency stab braking, you should:
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a. Pump the brake pedal rapidly and lightly.
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b. Press on the brake pedal as hard as you can, release the brakes
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when the wheels lock, and when the wheels start rolling put on
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the brakes fully again.
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c. Brake hard until the wheels lock, then get off the brakes for as
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much time as the wheels were locked.
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d. Press hard on the brake pedal and apply full hand valve until
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you stop. i,- b. Press on the brake pedal as hard as you can,
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release the brakes when the wheels lock, and when the wheels
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start rolling put on the brakes fully again.
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The parking or emergency brake on a heavy vehicle can only be
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held in position by something that cannot leak away, like:
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a. Fluid pressure
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, b. Spring pressure
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c. Air pressure
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d. Any of the above
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A straight truck or bus air brake system should not leak at a rate
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of more than __ psi per minute with the engine off and the brake
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released.
a. 1
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b. 2
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c. 3
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d. 4
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Your vehicle has dual air brake system. If low air pressure warning
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comes on for the secondary system or for one system, you should:
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a. Bring the vehicle to a safe stop and continue only when the
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system is fixed. i,- i,-
b. Reduce your speed, and test the remaining system while under-
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way.
c. Reduce your speed, and drive to the nearest garage for repairs.
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100% Correct Answers | Latest 2025/2026. i,- i,- i,- i,- i,-
Air braking takes more time than hydraulic because air:
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a. Brakes use different brake drums.
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b. Takes more time to flow through the lines than hydraulic fluid.
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c. Brakes require heavier return springs.
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d. Is always leaking through airline fittings.
i,- i,- b. Takes more i,- i,- i,- i,- i,-i,- i,- i,- i,- i,-
time to flow through the lines than hydraulic fluid.
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The brake pedal in an air brake system:
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a. Controls the speed of the air compressor.
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b. Always needs to be held down halfway during normal driving.
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c. Controls the air pressure applied to put on the brakes.
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d. Is connected to slack adjusters by a series of rods and linkages.
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i,- c. Controls the air pressure applied to put on the brakes.
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With air brake vehicles, the parking brakes should be used:
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,a. Whenever you leave the vehicle unattended.
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b. To hold your speed when going downhill.
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c. As little as possible.
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d. Only during pre and post-trip inspections.
i,- i,- i,- i,- i,- i,- i,-i,- i,- a. Whenever
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you leave the vehicle unattended.
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For emergency stab braking, you should:
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a. Pump the brake pedal rapidly and lightly.
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b. Press on the brake pedal as hard as you can, release the brakes
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when the wheels lock, and when the wheels start rolling put on
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the brakes fully again.
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c. Brake hard until the wheels lock, then get off the brakes for as
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much time as the wheels were locked.
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d. Press hard on the brake pedal and apply full hand valve until
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you stop. i,- b. Press on the brake pedal as hard as you can,
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release the brakes when the wheels lock, and when the wheels
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start rolling put on the brakes fully again.
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The parking or emergency brake on a heavy vehicle can only be
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held in position by something that cannot leak away, like:
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a. Fluid pressure
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, b. Spring pressure
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c. Air pressure
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d. Any of the above
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A straight truck or bus air brake system should not leak at a rate
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of more than __ psi per minute with the engine off and the brake
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released.
a. 1
i,-
b. 2
i,-
c. 3
i,-
d. 4
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Your vehicle has dual air brake system. If low air pressure warning
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comes on for the secondary system or for one system, you should:
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a. Bring the vehicle to a safe stop and continue only when the
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system is fixed. i,- i,-
b. Reduce your speed, and test the remaining system while under-
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way.
c. Reduce your speed, and drive to the nearest garage for repairs.
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