Practice question

During Maryland CDL combination-vehicle preparation, what should a driver remember about the trailer hand valve?

The trailer hand valve should be used only to test trailer brakes, not for normal driving.
Use the trailer hand valve for normal stops
Drive with trailer air pressure faults
Assume ABS permits tailgating or poor brake checks

Answer: A — The trailer hand valve should be used only to test trailer brakes, not for normal driving.

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