Practice question

Why should the trailer hand valve not be used as a parking brake?

Air can leak off and release the service brakes
It locks the kingpin permanently
It disconnects lights
It lowers landing gear

Answer: A — Air can leak off and release the service brakes

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

Practice more: Georgia CDL Combination Vehicles Test Practice Questions - Georgia Commercial Driver License Combination Vehicles Test Exam →