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Answer :
Final answer:
The tractor protection valve protects the tractor air supply by cutting off the air to the trailer when its pressure drops below a certain level, ensuring the tractor retains enough air to operate its own brakes.
Explanation:
The tractor protection valve has the crucial role of protecting the tractor air supply in a truck's air brake system. Its purpose is to ensure that the tractor, or the truck portion of a tractor-trailer combination, maintains sufficient air pressure to operate its own brakes, even in the event of a trailer air leak.
The valve does this by cutting off the air supply to the trailer when the trailer's air pressure falls below a set threshold, thereby preserving the air needed for the tractor's brakes. While the valve does interact with the trailer's brakes, it does not supply air to the trailer, activate the trailer brakes directly, or regulate tire pressure; its main function is protective.
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