AIR BRAKES PRACTICE TEST - OKLAHOMA
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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 Oklahoma CDL knowledge test. The OK 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 Oklahoma CDL Manual. Take this OK CDL practice test now to prepare for the actual air brakes test!
1.
Supply pressure gauges tell drivers:
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how much air pressure they are applying to the brakes.
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how much pressure is in the air tanks.
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All of the above.
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2.
Hydroplaning is more likely if:
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tire tread is worn.
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tire pressure is low.
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All of the above.
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3.
Trailers built on or after March 1, 1998 are required to be equipped with anti-lock brakes. These trailers will have:
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yellow malfunction lamps on the left side.
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red malfunction lamps on the left side.
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yellow malfunction lamps on the right side.
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4.
Which of the following can cause brakes to fade or fail?
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Excessive use of the service brakes
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Brakes out of adjustment
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All of the above.
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5.
If air pressure does not build up fast enough:
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you should turn the electrical power on and step on and off the brake pedal.
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you should put the parking brake on and gently pull against it in a low gear.
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the pressure may drop too low during driving.
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