CDL Air Brakes Practice Test - Vermont
11.
To use the controlled braking method in an emergency, you should:
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apply your brakes all the way, and release the brakes when the wheels lock up.
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apply the brakes when the wheels lock up.
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apply the brakes as hard as you can without locking the wheels.
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12.
The safety valve is usually set to open at:
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200 psi
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150 psi
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125 psi
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13.
When driving at night, you should:
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drive slowly enough to see obstacles with your headlights.
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look directly at the lights of oncoming vehicles.
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put your own high beams on if other drivers don't put their low beams on.
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14.
On any upgrade, gravity:
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doubles your speed.
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slows you down.
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speed you up.
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15.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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You may not notice a major leak in the service line until you try to put the brakes on.
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