Question:
Your truck or bus has dual parking control valves. What is the purpose of using pressure from a separate tank?
A
To release the spring emergency/parking brakes to move a short distance.
explanation
When main air pressure is lost, the spring brakes come on. Some vehicles, such as buses, have a separate air tank which can be used to release the spring brakes. This is so you can move the vehicle in an emergency. [California Commercial Driver Handbook]
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