CDL AIR BRAKES PRACTICE TEST - GEORGIA
21.
To test the low pressure warning signal, you should:
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pump the brakes while your vehicle is running.
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manually let the air out of your brakes and see if the signal comes on.
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shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
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check the air hoses connected to the brake chambers to make sure they aren't cut.
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22.
When should you be particularly careful about high winds?
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When driving at night
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When emerging from a tunnel
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When driving in winter
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When going downhill
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23.
When the spring brakes are on, you should push the brake pedal down:
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Only when driving downhill.
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Only when approaching railroad-highway crossings.
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Never.
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Only when driving uphill.
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24.
Controlled braking:
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must be used when you need to turn sharply while braking.
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can be used to keep your vehicle in a straight line and allow you to turn if necessary.
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involves pumping the brakes while keeping steering wheel movements very small.
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involves locking the wheels and then releasing the brakes.
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25.
The tractor protection valve:
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provides the air supply for the brake system.
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will close if you apply the parking brakes.
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will close automatically if the air pressure drops to a certain level.
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All of the above.
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