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What does the tractor protection valve do?

A Keeps air in the braking system, should the trailer break away or develop a leak
Explaination
The tractor protection valve keeps air in the tractor or truck braking system, should the trailer break away or develop a bad leak. more
B Protects the tractor from being stolen
C Protects the tractor from exceeding a set speed
D Ensures oil adequately lubricates the engine