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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. Too little weight on the driving axles can cause:
poor visibility.
longer stopping distances.
mechanical damage.
poor traction.
2. Banked curves:
are reserved for pedestrians.
should always be avoided.
have a safe "design speed".
can be taken at any speed.
3. Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
30 to 35 psi.
55 to 74 psi.
20 to 45 psi.
5 to 15 psi.
4. When the low air pressure warning light and buzzer first come on, you should:
immediately put alcohol into the air system.
downshift and slow down.
bring the vehicle to a safe stop right away.
speed up to restore pressure.
5. The trailer hand valve should:
never be used for parking.
never be used to test the trailer brakes.
be used in driving.
All of the above.
6. Stepping on and off the brake pedal several times:
may result in dangerously thin linings.
may cause air leaks.
reduces the air pressure in the tanks.
All of the above.
7. You supply air to the trailer brake system by:
pulling out the trailer air supply valve.
connecting the tractor service air line to the trailer service glad hand.
plugging the electrical cord into the trailer.
pushing in the trailer air supply knob.
8. Brake drums or discs must not have cracks longer than ____ the width of the friction area.
9. Parking brakes are:
not required on trailers.
not required on buses.
required on all vehicles.
not required on commercial vehicles with air brakes.
10. Air pressure should build up in a single air system, within about:
10 minutes.
1 minute.
3 minutes.
15 minutes.
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UT CDL Air Brakes Test

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