Practice question

For the Washington CDL Air Brakes knowledge test, is it correct to use the parking brake to slow or stop the vehicle while driving?

  1. Yes, in emergencies
  2. Yes, on icy roads
  3. No — the parking brake should never be used to slow a moving vehicle
  4. Yes, on long downgrades

Answer: C — No — the parking brake should never be used to slow a moving vehicle

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