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Free Alabama DMV CDL Manual Air Blakes Test 2
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Question Number 22
22. When operating a vehicle with a dual air brake system, the driver should:
Let the vehicle warm up before driving to ensure that the fuel reaches the engine.
Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.
Begin driving just after the vehicle starts.
✔ Correct Answer:
Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.
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