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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