AIR BRAKES CDL PRACTICE TEST - ARKANSAS
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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 Arkansas CDL knowledge test. The AR 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 Arkansas CDL Manual. Take this AR CDL practice test now to prepare for the actual air brakes test!
1.
The spring brakes come on:
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when you lose ABS control.
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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when you bring the vehicle to a complete stop right away.
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when main air pressure is lost.
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2.
If you are being tailgated, you should:
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move to the left lane.
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speed up.
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flash your brake lights.
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increase your following distance.
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3.
Vehicles with air brake systems take longer to come to a complete stop than vehicles with hydraulic brakes because of:
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tire pressure.
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brake lag.
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reaction distance.
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brake fading.
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4.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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55 to 74 psi.
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20 to 45 psi.
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5 to 15 psi.
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30 to 35 psi.
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5.
Why must air tanks be drained?
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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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Water and
oil reduce the air pressure.
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To keep from fouling the air compressor oil.
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