Practice question

What is the purpose of the parking brake during an emergency?

  1. To increase brake efficiency.
  2. To hold the vehicle stationary in case of air brake system failure.
  3. To provide extra braking power.
  4. To decrease air pressure in the brake system.

Answer: B — To hold the vehicle stationary in case of air brake system failure.

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Practice more: CDL Air Brakes Endorsement Test →