9. In a vehicle with dual parking control valves, ...

Free Alabama DMV CDL Manual Air Blakes Test 2

9. In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

You will be unable to move the vehicle.

A separate air tank can be used to release the spring brakes for a short period of time.

You can use the spring brakes to continue driving normally.

The air tanks will automatically refill to a safe air pressure level.

✔ Correct Answer:

A separate air tank can be used to release the spring brakes for a short period of time.