Practice question

For the Washington CDL Air Brakes knowledge test, what is a Jake brake (engine compression brake)?

  1. A type of parking brake
  2. A retarder that uses engine cylinder compression to slow the vehicle without using service brakes
  3. A trailer brake
  4. A hand brake

Answer: B — A retarder that uses engine cylinder compression to slow the vehicle without using service brakes

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