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!
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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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6.
To check that spring brakes come on automatically, the first thing to do is to:
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continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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turn off the engine, release the parking brake and time the air pressure drop.
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release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
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7.
What is an important thing to remember about emergency braking?
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Pushing down on the brake pedal as hard as you can will only keep the wheels locked up and cause a skid.
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You should never use stab braking.
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Your natural response (hitting the brakes) is never the right solution.
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8.
The tractor protection valve:
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provides the air supply for the brake system.
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will close automatically if the air pressure drops to a certain level.
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All of the above.
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9.
If the air tanks are not drained:
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the air pressure in the tanks is reduced.
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the water can freeze in cold
weather and cause brake failure.
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your speed must be reduced to 5 MPH below your “safe” speed.
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10.
Perception Distance + Reaction Distance + Brake Lag Distance + Braking Distance = ?
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Stopping Distance - (minus) Brake Fade Distance
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Total Air Pressure
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Total Stopping Distance
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OK Air Brakes CDL Test
| Number of questions: | 25 |
| Correct answers to pass: | 20 |
| Passing score: | 80% |
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