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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:
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"S" stands for "Shoes".
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it applies a "Shock" to the brakes.
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it is a safe-driving brake.
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it is shaped like the letter "S".
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2.
Antilock brakes:
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let you drive faster.
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help you stop faster.
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decrease your stopping distance.
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None of the above.
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3.
If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
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tight.
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loose.
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cracked.
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worn.
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4.
Brake fade results from:
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excessive wear.
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excessive speeding.
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excessive use of the service brakes.
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excessive smoke.
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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:
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the service line valve close.
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a thumping sound.
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a mechanical vibration.
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air escaping from the open valve.
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