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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.
emergency relay valve
one-way check valve
air compressor drive belt
tractor protection valve
2. Brake fade results from, and is affected by:
excessive heat caused by not relying on the engine braking effect.
excessive heat caused by using the brakes too much.
brakes out of adjustment.
All of the above.
3. An Anti-lock Braking System (ABS):
always shortens your stopping distance.
increases your normal braking capability.
keeps your wheels from locking up when you brake hard.
lets you drive faster.
4. How do you check that spring brakes come on automatically?
Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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.
All of the above.
5. On front tires, tread should be at least:
1/16 inch
4/16 inch
4/32 inch
2/32 inch
6. Controlled braking:
involves locking the wheels and then releasing the brakes.
involves pumping the brakes while keeping steering wheel movements very small.
can be used to keep your vehicle in a straight line and allow you to turn if necessary.
must be used when you need to turn sharply while braking.
7. What is an important thing to remember about emergency braking?
You should never use stab braking.
Pushing down on the brake pedal as hard as you can will only keep the wheels locked up and cause a skid.
The more heavily loaded semitrailer trailer should be in the rear.
Your natural response (hitting the brakes) is never the right solution.
8. If your brakes fail while you are driving on a downgrade, you should:
immediately start looking outside your vehicle for something to stop it.
take the least hazardous escape route you can.
use an escape ramp if it's available.
All of the above.
9. Some air brake systems have an alcohol evaporator. Checking the alcohol container and filling it up as necessary:
helps keep the engine cool, as well as lubricating it.
helps you avoid wheel lock up.
reduces the risk of having an accident due to drowsy driving.
reduces the risk of ice in air brake valves during cold weather.
10. The stop light switch:
should be used to fend off tailgaters.
tells you when you need to use your parking brake instead of the service brake.
turns on the brake lights when you put on the air brakes.
warns you when the air supply pressure drops below 55 psi.
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UT CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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