AIR BRAKES PRACTICE TEST - WISCONSIN
6.
What is the best way to test the low air pressure warning signal?
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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 to reduce air pressure to below 60 psi.
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step on and off the brake pedal while the engine is running.
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pump the brakes until the air pressure drops below 45 psi.
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All of the above.
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7.
The best way to recognize that your trailer has started to skid is:
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by recognizing tire failure.
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by seeing it in your mirrors.
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by opening the window and feeling the front of the mirror.
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by feeling the brakes come on.
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8.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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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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The air could leak out of the trailer air tank, releasing its emergency brakes.
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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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None of the above.
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9.
To check that spring brakes come on automatically, the first thing to do is to:
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release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
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continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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turn off the engine, release the parking brake and time the air pressure drop.
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All of the above.
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10.
When the spring brakes are on, you should never:
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decrease your speed.
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change lanes.
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push the brake pedal down.
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upshift.
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