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Answer :
Final answer:
The recommended procedure to test the tractor protection valve is to charge the trailer air brake system, turn off the engine, and test the valve. The correct answer is B
Explanation:
The recommended procedure to test the tractor protection valve is to charge the trailer air brake system, turn off the engine, and test the valve. This is done to simulate real-world conditions and ensure that the valve is functioning properly. Here's how it's done:
- Start by charging the trailer air brake system to ensure there is enough pressure.
- Turn off the engine and wait for the air pressure to stabilize.
- Locate the tractor protection valve, which is usually located near the rear of the vehicle.
- Connect a pressure gauge to the valve and check the reading.
- Gradually apply and release the trailer brakes while monitoring the pressure gauge.
- If the pressure drops significantly or does not hold steady, there may be a problem with the tractor protection valve that requires further inspection or repair.
A proper functioning tractor protection valve should not allow air to escape from the trailer system when the engine is off and the system is pressurized. This procedure is critical for maintaining the safety and functionality of a truck's braking system.
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