South Dakota CDL Practice Test 2

A tractor protection valve is:

A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak. A device that prevents theft. A device that controls fuel levels. A device that allows the battery to recharge efficiently.

Correct Answer:

A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.

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