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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 s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
"S" stands for "Shoes".
it applies a "Shock" to the brakes.
it is a safe-driving brake.
it is shaped like the letter "S".
2. Antilock brakes:
let you drive faster.
help you stop faster.
decrease your stopping distance.
None of the above.
3. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
4. Brake fade results from:
excessive wear.
excessive speeding.
excessive use of the service brakes.
excessive smoke.
5. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
the service line valve close.
a thumping sound.
a mechanical vibration.
air escaping from the open valve.
6. Why must air tanks be drained?
Water and oil reduce the air pressure.
Water can freeze in cold weather and cause brake failure.
The low boiling point of water reduces braking power.
To keep from fouling the air compressor oil.
7. After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
applying and releasing the trailer brakes and listening for the sound of trailer brakes.
shutting the engine off so you can hear the brakes.
checking the air brake system pressure gauge for signs of major air loss.
All of the above.
8. Why should you check your mirrors regularly to know where other vehicles are around you?
To flash the brake lights if you are being tailgated.
To know whether you can make a quick lane change in an emergency.
To move out of their way if they want to get past.
To better assess your own speed.
9. If your vehicle is hydroplaning, you should:
release the accelerator and push in the clutch.
use the brakes to slow down.
accelerate to get through the water as quickly as possible.
None of the above.
10. Supply pressure gauges tell drivers:
how much pressure is in the air tanks.
how much air pressure they are applying to the brakes.
how much pressure the relay valves should send to the trailer brakes.
All of the above.
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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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