In Partnership with Doug Truscott Driving School
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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.
When the spring brakes are on, you should:
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press the accelerator.
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pump the brakes.
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exceed the posted speed limit.
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not push the brake pedal down.
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2.
With brake drums, if brakes become too hot:
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the air compressor will kick on to cool the brakes.
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the brakes will supply too much power to the drive wheels.
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your ABS will malfunction.
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the brakes may stop working.
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3.
Passive railroad crossings:
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should never be crossed using a CMV.
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usually have a person directing traffic.
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do not have traffic control devices.
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have at least one traffic control device.
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4.
To check the slack adjusters:
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check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
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Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
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park downhill and see if the vehicle rolls.
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None of the above.
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5.
Most heavy duty vehicles use ___ air brake systems for safety.
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single
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dual
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reduced
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triple
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