In Partnership with Wissahickon Valley Public Library
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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 Pennsylvania CDL knowledge test. The PA 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 Pennsylvania CDL Manual. Take this PA CDL practice test now to prepare for the actual air brakes test!
1.
If you're feeling tired while driving you should:
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eat something.
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increase your speed to get to your destination quicker.
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stop driving and get some rest.
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drink coffee.
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2.
When you push the brake pedal down, air brakes work:
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only when ABS is working.
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immediately.
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after about 15 seconds.
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after a short delay.
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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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brake fading.
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brake lag.
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reaction distance.
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tire pressure.
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4.
Emergency brakes are:
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not required on buses.
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required on all vehicles.
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not required on doubles.
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not required on commercial vehicles with air brakes.
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5.
The application pressure gauge shows:
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how much pressure is in the air tanks.
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how much pressure the relay valves should send to the trailer brakes.
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how much air pressure you are applying to the brakes.
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All of the above.
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