3. When operating a vehicle with a dual brake syst...

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Free Alabama DMV CDL Double Test 2

Question Number 3

3. When operating a vehicle with a dual brake system, a driver should:

Let the vehicle warm up before driving to ensure that fuel reaches the engine.

Wait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems.

Begin driving just after the vehicle starts.

Pump the pedal about 20 times to build pressure, then begin driving.

✔ Correct Answer:

Wait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems.

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