Practice question

What occurs during the 'compressor cut-out' phase of an air brake system check?

  1. The compressor shuts down completely due to low oil pressure
  2. The governor stops the compressor from pumping air into the tanks, usually when pressure reaches approximately 120 to 135 psi (828 to 931 kPa)
  3. The safety valve opens to bleed off excess air pressure
  4. The air dryer discharges oil and water

Answer: B — The governor stops the compressor from pumping air into the tanks, usually when pressure reaches approximately 120 to 135 psi (828 to 931 kPa)

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