Air Brakes Practice Test - North Carolina
21.
Do NOT use the parking brakes:
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when you park for less than two hours.
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to test that they work.
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when you leave your vehicle.
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if the brakes are very hot.
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22.
Spring brakes:
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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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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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All of the above.
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23.
The spring brakes come on:
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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when you lose ABS control.
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when you bring the vehicle to a complete stop right away.
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when main air pressure is lost.
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24.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/5
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1/3
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1/4
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1/2
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25.
Distracted driving may be caused by _________ while driving.
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maintaining constant speed
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eating
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listening to music
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All of the above.
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