DC CDL AIR BRAKES PRACTICE TEST
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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 District of Columbia CDL knowledge test. The DC 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 District of Columbia CDL Manual. Take this DC CDL practice test now to prepare for the actual air brakes test!
1.
What should you do to test your vehicle's low air pressure warning signal?
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Release the parking brake valve and the tractor protection valve and reduce the air pressure by stepping on and off the brake pedal.
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With the engine running, put the vehicle in a forward gear and attempt to drive forward.
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With the key in the "on" or "battery charge" position, rapidly apply and release the foot brake.
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Pump the brakes until the air pressure drops below 80 psi.
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2.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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50 psi
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150 psi
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35 psi
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3.
Before transporting sealed loads, you should check that:
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the load can be inspected.
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the load is properly secured.
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the seal numbers match the placard numbers.
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All of the above.
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4.
When driving a 60 foot truck at 35 mph in ideal conditions, you should keep at least _______ of space in front of you.
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12 seconds
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5 seconds
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4 seconds
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6 seconds
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5.
A driver distraction is anything that takes your attention away from driving, such as:
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adjusting the radio.
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pedestrians.
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billboards.
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All of the above.
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