Practice question

Which statement is correct about the trailer hand valve for the Maryland CDL Combination Vehicles test?

Assume ABS permits tailgating or poor brake checks
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

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

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