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The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ______ brake line.

A) Service
B) Parking
C) Emergency

Answer :

Final answer:

The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the service brake line. The tractor protection valve is a safety device in the air brake system of a tractor-trailer combination. It activates the trailer emergency brakes in the event of a loss of air pressure in the service brake line.

Explanation:

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

The tractor protection valve is a safety device in the air brake system of a tractor-trailer combination. It is designed to close and activate the trailer emergency brakes when there is a loss of air pressure in the service brake line, such as in the event of a major leak.

The service brake line is responsible for transmitting pressure from the brake pedal to the brake chambers, which apply the brakes. If there is a major leak in the service brake line, the tractor protection valve will close, cutting off the air supply and causing the trailer emergency brakes to come on.

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