17. A tractor protection valve is:

2026 District Of Columbia DMV Combination Class A Test 1

17. 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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