What is a tractor protection valve?

Question

In a combination vehicle with air brakes, the tractor protection valve keeps air in the tractor or truck brake system in the event of the trailer breaking away or developing a leak.

Accepted Answer

A valve to keep air in the brake system should there be a bad leak

Answer

A valve that prevents the truck from being stolen

Answer

A valve that prevents the driver from going too fast

Answer

A valve that prevents the trailer from accidentally being released

What is a tractor protection valve?

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