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Ontario Air Brake Practice · Question

After ensuring maximum air pressure is achieved, how do you perform a governor cut-in test?

To perform a governor cut-in test, you must reduce the system air pressure by repeatedly applying and releasing the service brakes until the air pressure drops

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Question: After ensuring maximum air pressure is achieved, how do you perform a governor cut-in test?

Answer options:

  • Apply the parking brake and observe for 5 minutes. ✅ Repeatedly apply and release the service brakes until the pressure drops and the compressor starts pumping again.
  • Turn off the engine and observe the pressure drop.
  • Fully apply the trailer hand valve and check the gauge.

Correct answer: Repeatedly apply and release the service brakes until the pressure drops and the compressor starts pumping again.

Explanation: To perform a governor cut-in test, you must reduce the system air pressure by repeatedly applying and releasing the service brakes until the air pressure drops to the cut-in value, at which point the compressor should start pumping again to restore pressure.

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