ILLINOIS CDL AIR BRAKES PRACTICE TEST
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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