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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 Illinois CDL knowledge test. The IL 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 Illinois CDL Manual. Take this IL CDL practice test now to prepare for the actual air brakes test!
1.
Brake fade results from, and is affected by:
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brakes out of adjustment.
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excessive heat caused by not relying on the engine braking effect.
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excessive heat caused by using the brakes too much.
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All of the above.
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2.
The use of air brakes on a steep downgrade is only a supplement to:
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the use of the parking brakes.
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the use of the "controlled braking" method.
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the braking effect of the engine.
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the use of the spring brakes.
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3.
Too little weight on the driving axles can cause:
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poor visibility.
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mechanical damage.
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poor traction.
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longer stopping distances.
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4.
A dual air brake system:
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has two separate air brake systems, which use a single set of brake controls.
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has two separate air brake systems, which use two separate sets of brake controls.
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has a single air brake system, which uses a single set of brake controls.
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has a single air brake system, which uses two separate sets of brake controls.
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5.
_________ must have a low air pressure warning signal.
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Vehicles with air brakes built after 2010
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Only vehicles with air brakes built before 2015
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All vehicles with air brakes
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Vehicles with air brakes built after 2005
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