Practice question

What is the purpose of the spring (parking) brake on a heavy vehicle equipped with air brakes?

  1. It only operates the horn
  2. It holds the vehicle stationary using spring force and automatically applies if air pressure drops too low, acting as a safety fail-safe
  3. It controls the headlights
  4. It has no function related to braking

Answer: B — It holds the vehicle stationary using spring force and automatically applies if air pressure drops too low, acting as a safety fail-safe

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