Don, Thanks for the photo. Can you tell me if your park brake valve has a plug in the bottom? Common sense tells me if it is a exhaust port then it should be open to release pressure. Looks as you have the 1/4 inch yellow line connected to the Delivery port and the 3/8 inch yellow line connected to the supply port. What color is the other Delivery port line? Turns out I have another air leak at tag axle valve on the pressure stat mounted on the side of tag axle valve.
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