Answer :

Final answer:

To test the tractor-protection valve, follow these steps: 1. Ensure the tractor is turned off and the parking brake is engaged. 2. Disconnect the trailer air supply line from the tractor. 3. Apply and hold the foot brake pedal. 4. Start the engine of the tractor. 5. If the tractor-protection valve is working correctly, the trailer air supply pressure gauge should not drop significantly.

Explanation:

To test the tractor-protection valve, follow these steps:

  1. Ensure the tractor is turned off and the parking brake is engaged.
  2. Disconnect the trailer air supply line from the tractor.
  3. Apply and hold the foot brake pedal.
  4. Start the engine of the tractor.
  5. If the tractor-protection valve is working correctly, the trailer air supply pressure gauge should not drop significantly. If it does, it indicates a fault in the valve.

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