Grimsley High
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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 North Carolina CDL knowledge test. The NC 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 North Carolina CDL Manual. Take this NC CDL practice test now to prepare for the actual air brakes test!
1.
Before leaving your vehicle unattended, you should:
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Chock the wheels.
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Apply the parking brake.
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Remove the keys.
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All of the above.
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2.
Why must air tanks be drained?
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To keep from fouling the air compressor oil.
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Water and
oil reduce the air pressure.
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The low boiling point of water reduces braking power.
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Water can freeze in cold weather and cause brake failure.
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3.
Which of the following is not part of the air brake system?
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Air compressor
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Alcohol evaporator
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Air storage tanks
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Air filter
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4.
Some air brake systems have an alcohol evaporator to:
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prevent ice from forming in the brake system.
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reduce the stopping power of the vehicle.
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reduce the danger of slipping.
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force the brake shoes away from one another.
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5.
Which of the following is NOT part of the drum brake?
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Brake drum
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Return spring
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Safety valve
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Axle
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