Practice question

Which statement about the trailer hand valve is correct?

  1. It can leak down and release service brakes
  2. Use the trailer hand valve for normal stops
  3. Ignore air leaks if pressure builds once
  4. Rely on parking brakes while the vehicle is moving

Answer: A — It can leak down and release service brakes

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

Practice more: Mississippi CDL Combination Practice Questions - Mississippi CDL Combination Vehicles Test Exam →