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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. Before driving a vehicle with a dual air system, the air compressor should build up a minimumĀ of _____ pressure in both the primary and secondary systems.
50 psi
10 psi
100 psi
75 psi
2. Do NOT use the parking brakes:
when you park for less than two hours.
if the brakes are very hot.
to test that they work.
when you leave your vehicle.
3. A passive railroad crossing is one that:
has at least two traffic control devices installed at the crossing to regulate traffic.
requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
does not have any type of traffic control device.
has a traffic control device installed at the crossing to regulate traffic.
4. If the low pressure warning signal doesn't work:
this could cause sudden emergency braking in a single-circuit air system.
in dual systems the stopping distance will be decreased.
you could lose air pressure and you would know it.
None of the above.
5. To prevent drowsiness you should:
get adequate sleep before a trip.
schedule trips for the middle of the night.
avoid exercise to save more energy.
never drive with a passenger.
6. To make the brakes work, air brakes use:
carbon monoxide.
hydraulic air.
compressed air.
7. You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:
you'll have to immediately retake your test using another vehicle.
you won't receive a CDL.
you will be restricted to driving vehicles without air brakes.
you'll need to take another knowledge test about air brakes.
8. Excessive use of the service brakes results in overheating. Too much heat can:
cause the brakes to squeak.
make the brakes stop working.
cause the brakes apply unevenly.
cause the brakes to grab.
9. The ______ puts alcohol into the air system.
alcohol storage tank
alcohol evaporator
alcohol tank drains
air tank drains
10. Air tanks must be drained completely to:
pump water and compressor oil into the tanks.
remove all moisture and oil.
put alcohol into the air system.
remove all the air.
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UT Air Brakes Test

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