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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 Alabama CDL knowledge test. The AL 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 Alabama CDL Manual. Take this AL CDL practice test now to prepare for the actual air brakes test!
1.
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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worn.
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tight.
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cracked.
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loose.
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2.
A low air pressure warning signal is required on:
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all vehicles with air brakes built after 2009.
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all vehicles with air brakes built after 2005.
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Warning signals are optional.
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all vehicles with air brakes.
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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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Air filter
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Alcohol evaporator
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Air storage tanks
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4.
To apply the parking brakes:
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pull the parking brake control knob out.
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place the parking brake control knob in Neutral.
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push the parking brake control knob in.
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push the brake pedal three times.
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5.
In a dual air brake system, if one air system is very low on pressure:
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either the front or rear brakes will not be operating fully.
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you should pump the brakes to restore pressure.
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the effect won't be noticeable for the first 50 miles.
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you should drive and brake as you always have.
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