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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 Tennessee CDL knowledge test. The TN 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 Tennessee CDL Manual. Take this TN CDL practice test now to prepare for the actual air brakes test!
1.
Which of the following is NOT a reason for hydraulic brake failure?
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Loss of hydraulic pressure
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Stab braking
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Brake fade on long hills
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All of the above.
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2.
To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?
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If you don't pass the air brakes test, you can't get a CDL.
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If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
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All trucks have air brakes.
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If you don't, you will only receive a CDL permit.
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3.
If your vehicle is hydroplaning, you should:
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release the accelerator and push in the clutch.
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use the brakes to slow down.
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accelerate to get through the water as quickly as possible.
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None of the above.
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4.
The ________ brake system applies and releases the brakes when the driver uses the brake pedal during normal driving.
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emergency
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anti-lock
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service
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parking
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5.
The Johnson bar is a valve that:
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works the trailer brakes.
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is installed in the first tank the air compressor pumps air to.
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keeps air from going out if the air compressor develops a leak.
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reduces the braking pressure to a safe level.
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