Service line valve is closed.
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Trailer hand brake is applied.
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Emergency line valve is open.
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Number of questions: | 20 |
Passing score: | 16 |
Service line valve is closed.
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Trailer hand brake is applied.
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Emergency line valve is open.
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Pump the air brakes to activate the ABS.
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Look into the back of the fifth wheel.
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Check for wheel speed sensors coming from the back of the brakes.
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Release the brakes.
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Accelerate.
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Quickly turn the steering wheel in one direction, then in the other.
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About five inches of space
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A maximum of two inches of space
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No space
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Prevent air from escaping air brake systems.
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Prevent air from entering air brake systems.
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Override vehicles that are out of control.
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Level with
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Slightly higher than
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Slightly lower than
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The trailer emergency brakes.
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A coupling device.
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The anti-lock brakes.
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