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The tractor protection valve will close, and the trailer emergency brakes will apply when there is a big leak in:

A. Service brake line.
B. Parking brake line.
C. Emergency brake line.

Answer :

Final answer:

The tractor protection valve will close and the trailer emergency brakes will apply when there is a big leak in the service brake line.

Explanation:

The tractor protection valve will close and the trailer emergency brakes will apply when there is a big leak in the Service brake line. A brake system prevents movement completely, while a valve system allows flow in one direction and prevents flow in the opposite direction.

The tractor protection valve acts as a one-way control system that closes when there is a big leak in the service brake line, preventing any flow of fluid in that direction.

When a big leak occurs in the service brake line, the tractor protection valve detects the loss of pressure and closes to prevent further fluid flow. This triggers the trailer emergency brakes to apply, ensuring that the trailer can come to a stop even if there is a major issue with the service brake line.

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Rewritten by : Barada