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2026 Kentucky DMV Combination Class A Test 1
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Question Number 4
4. The tractor protection valve:
Ensures that oil adequately lubricates the engine.
Protects the tractor from exceeding a set speed.
Keeps air in the truck braking system if the trailer develops a leak.
✔ Correct Answer:
Keeps air in the truck braking system if the trailer develops a leak.
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