22. When operating a vehicle with a dual air brake...

Free Alabama DMV CDL Manual Air Blakes Test 2

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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