Maryland CDL Air Brakes Practice Test

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.

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