Practice question

What is the tested combination-vehicle principle for the trailer hand valve?

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.

The correct answer is shown above. Try the full quiz for additional practice.