CDL AIR BRAKES PRACTICE TEST - DISTRICT OF COLUMBIA
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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.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than ___ the width of the friction area.
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1/2
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1/4
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9/10
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3/5
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2.
Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?
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Air brakes use different brake drums.
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When driving vehicles with air brakes, the average perception distance increases from 400 feet to 2200 feet.
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It takes one half second or more for the air to flow through the lines to the brakes.
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Stopping distance for vehicles with air brakes is made up of six different factors.
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3.
Empty trucks have the best braking. True or False?
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False.
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True.
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It depends on the truck.
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It depends on the cargo.
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4.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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5, 25 and 50 feet
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10, 100 and 200 feet
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5, 50 and 500 feet
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3, 15 and 45 feet
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5.
Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
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for 3 days
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for one day
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several times
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for one stop
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