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Tm 9-2320-272-10 Tm 9-2320-272-10 page 3-55 paragraph 3-12 you can shut the primary or secondary system down to get pressure back to the brakes

Okay I know I am late but maybe it will help someone when they have the same problems, if you would have read the tm's you would have found that there are two valves on the airtank in between the frame that you can shutoff one at a time to get pressure to the brakes. Sorry I didn't see your post...