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When checking the trailer emergency brakes, make sure that the tractor protection control valve is placed in the _______ position.

1. Normal
2. Emergency
3. Neutral

Answer :

When checking the trailer emergency brakes, it is important to ensure that the tractor protection control valve is placed in the emergency position. This is because the emergency position is designed to cut off the air supply to the tractor's service brakes, which in turn allows the trailer emergency brakes to engage.

  • This ensures that the trailer brakes are fully functional and able to bring the vehicle to a safe stop in case of an emergency.
  • The normal position, on the other hand, allows the tractor's air supply to reach both the service and emergency brakes, which can cause confusion and make it difficult to isolate which brakes are malfunctioning.
  • Similarly, the neutral position also does not provide the necessary air supply to activate the trailer emergency brakes.
  • It is important to note that checking the trailer emergency brakes should be a regular part of your pre-trip inspection routine, as it can help prevent accidents and ensure that your vehicle is operating safely on the road.
  • By ensuring that the tractor protection control valve is in the correct position when checking the trailer brakes, you can be confident that your vehicle is equipped to handle emergency situations and keep you and other drivers safe.

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