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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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