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If your truck or bus has dual parking control valves, you can use air pressure from a separate tank to

A release the spring emergency/parking brakes.
With a dual parking control valve you can use the pressure from a separate air tank to give enough air pressure to release the spring brakes and move your vehicle. This is very useful in emergency situations.
B stay parked twice as long without using up service air pressure.
C balance the service brake system when you are parked.