Answer :
The tractor protection valve is an important safety feature in commercial trucks that are equipped with air brakes. It is designed to protect the braking system from failure in case of a major leak in the brake line.
When the tractor protection valve senses a loss of air pressure in the system, it will close automatically, thereby isolating the tractor's braking system from the trailer's braking system. In this situation, the trailer's emergency brakes will come on automatically, bringing the vehicle to a safe stop. This feature is essential for preventing accidents and ensuring the safety of both the driver and other road users. Therefore, the correct answer to your question is the trailer's emergency brakes will come on when there is a major leak in the brake line. It is important for drivers to be familiar with the operation of the tractor protection valve and to check the brake system regularly for leaks or other issues that could compromise its performance. Regular maintenance and inspection of the brakes is critical to ensure that they are in good working order and that the tractor protection valve can function as intended.
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