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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.
You should NOT use the parking brakes if:
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the brakes are too dry.
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the brakes are cold.
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the brakes are very hot.
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All of the above.
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2.
Your vehicle has air brakes. To stop, you should:
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release the accelerator, push in the clutch, and shift to Neutral at the same time.
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push the brake pedal down.
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pump the brake pedal 3 times.
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pull the parking brake control knob out.
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3.
Which of the following is not a type of retarder?
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Pressure
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Hydraulic
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Electric
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Exhaust
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4.
Weight that is loaded so there is a high center of gravity:
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causes greater chance of rollover.
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makes a vehicle easier to handle.
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reduces the chance that the load will shift to the side or fall off.
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All of the above.
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5.
Before starting down a hill, you should:
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look for an escape route.
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slow down and shift to a lower gear.
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apply the brakes hard.
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release the accelerator and shift to Neutral at the same time.
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6.
If your ABS is not working:
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you should immediately bring your vehicle to a complete stop.
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it will slow your truck to a halt and force you to pull over.
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you still have normal brake functions, and should drive and brake as you always have.
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the drive wheels will begin to spin, and you should take your foot off the accelerator.
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7.
The most common foundation brakes found on vehicles with air brakes are the:
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S-cam brakes.
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parking brakes.
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wedge brakes.
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disc brakes.
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8.
Spring brakes:
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are air applied like service brakes.
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apply when air pressure leaves the brake chamber and release when air pressure builds up in the chamber.
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are not designed to work in an emergency when your service brakes fail.
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All of the above.
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9.
With brake drums, if brakes become too hot:
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the air compressor will kick on to cool the brakes.
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the brakes may stop working.
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your ABS will malfunction.
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the brakes will supply too much power to the drive wheels.
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10.
Spring brakes:
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are usually held back by air pressure.
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will apply the brakes when a leak in the air brake system causes all the air to be lost.
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will come fully on when air pressure drops to a certain range, typically 20 to 30 psi.
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All of the above.
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