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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Utah CDL knowledge test. The UT CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Utah CDL Manual. Take this UT CDL practice test now to prepare for the actual air brakes test!
1.
The __________ keeps air from going out if the air compressor develops a leak.
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emergency relay valve
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one-way check valve
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air compressor drive belt
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tractor protection valve
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2.
Brake fade results from, and is affected by:
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excessive heat caused by not relying on the engine braking effect.
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excessive heat caused by using the brakes too much.
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brakes out of adjustment.
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All of the above.
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3.
An Anti-lock Braking System (ABS):
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always shortens your stopping distance.
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increases your normal braking capability.
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keeps your wheels from locking up when you brake hard.
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lets you drive faster.
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4.
How do you check that spring brakes come on automatically?
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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All of the above.
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5.
On front tires, tread should be at least:
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1/16 inch
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4/16 inch
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4/32 inch
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2/32 inch
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