AIR BRAKES PRACTICE TEST - ILLINOIS
11.
The one-way check valve:
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keeps air from going out if the air compressor develops a leak.
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keeps your wheels from locking up when you brake hard.
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supplies air to the trailer air tanks.
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keeps the axles in place.
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12.
The air compressor governor controls:
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when the air compressor will pump air into the air storage tanks.
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when air tank pressure falls below the “cut-out” level.
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the air pressure applied to the brakes.
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the speed of the air compressor.
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13.
To test the service brake:
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gently try to pull forward with the trailer parking brake on, then release the brake.
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shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
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push the brake pedal firmly while slowly moving backward.
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push the brake pedal firmly while going about 5 mph.
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14.
You are coming down a long, steep downgrade. Which of the following is a sign that your brakes may have started to fade?
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The steering feels heavy.
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You have to apply your brakes harder and harder to get the same stopping power.
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You hear a loud "bang".
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The brake pedal feels spongy or goes to the floor.
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15.
If you are feeling sleepy, you should:
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drive faster.
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pull off the road and rest.
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slow down.
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get some coffee.
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