Does it leak all the time or only when the parking brakes are released?
If it leaks only while the parking brakes are released it sounds like a bad diaphragm in a parking broke release "chamber" has failed and is leaking air into the service brake side which is then exiting through a "quick release valve".
(A you likely know, there's a BIG deadly spring in the parking brake "chamber", do NOT attempt to disassemble, it can KILL you. Replace the complete assembly IF needed.)
Another possible problem would be a "treadle valve" with a stick mechanism so the brake pedal doesn't come all the way "up" when released or an internal leak in the treadle valve.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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