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2026 District Of Columbia DMV Combination Class A Test 1
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Question Number 17
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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