Practice question

What is the main purpose of the safety valve in an air brake system reservoir?

  1. To protect the system from over-pressurization if the governor fails to cut out, typically set to open at 150 psi
  2. To drain moisture from the tanks automatically
  3. To apply the spring brakes if air pressure drops
  4. To prevent oil from entering the brake lines

Answer: A — To protect the system from over-pressurization if the governor fails to cut out, typically set to open at 150 psi

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