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Update: This problem turned out to be a bad diaphram. The problem with locating it for me was not having a helper. I would have to start the truck to build pressure, then place a brace on the brake pedal then jump out and try to back off the vent line on a particular wheel prior to loosing all...

I wish it was that simple. Somehow air pressure is getting to the vent lines only while the brakes are depressed.

Gentlemen, My M923 losses air from the secondary tank when the brake pedal is held, like at a stop light. It will bleed down and activate the low air warning system. There is a hissing sound from the intake stack while this is occurring. I have check all lines and diaphrams/canisters and...