OR CDL AIR BRAKES PRACTICE TEST
21.
Spring brakes:
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are usually held back by air pressure.
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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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will apply the brakes when a leak in the air brake system causes all the air to be lost.
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All of the above.
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22.
A driver distraction is anything that takes your attention away from driving, such as:
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pedestrians.
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adjusting the radio.
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billboards.
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All of the above.
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23.
Do NOT use the parking brakes:
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if the brakes are very hot.
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to test that they work.
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when you leave your vehicle.
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when you park for less than two hours.
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24.
When backing, you should:
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only use mirror on the driver's side.
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back quickly.
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back and turn toward the right side whenever possible.
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use the mirrors on both sides.
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25.
If you get stuck on railroad tracks, you should:
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stay in the vehicle and call for help.
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have a helper push your vehicle.
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check the engine compartment quickly.
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get out of the vehicle and away from the tracks.
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