Practice question

You hear a continuous loud hiss after building system pressure. What is most likely happening?

  1. The compressor is overheating
  2. There is a large air leak somewhere in the brake system
  3. The air dryer is malfunctioning
  4. The trailer is full

Answer: B — There is a large air leak somewhere in the brake system

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

Practice more: Ohio CDL Air Brakes Test Practice Questions - Ohio Commercial Driver License (CDL) Air Brakes Knowledge Test Exam →