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------------------------------------------------ When the trailer has been coupled to the tractor, the tractor protection control valve should be placed where?

A. In the open position to allow normal air flow.
B. In the closed position to prevent air from entering the trailer's brake system.
C. In the middle position for partial protection.
D. In the emergency position to lock the trailer brakes.

Answer :

Final answer:

The tractor protection control valve should be placed in the closed position to prevent air from entering the trailer's brake system.

Explanation:

When the trailer has been coupled to the tractor, the tractor protection control valve should be placed in the closed position to prevent air from entering the trailer's brake system.

This ensures that the trailer brakes do not activate unintentionally and helps maintain control while towing.

By keeping the tractor protection control valve closed, the trailer's brake system remains separate from the tractor's, enhancing safety and preventing potential damage.

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