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Somemedic you have the same disease I do and I haven't fixed it yet either. I'm going with Crane trucks idea when I get to crawling around. Also want to look at fabbing a remote tank for filling and storage.

Jdt Sorry I was not clear the pedal can be pushed to the floor with no back pressure from the hydraulics. The pedal does sring back with the proper movement from the return spring. Cranetruck told me of the bleeder on top of the airpac itself. I will try that now.

Does the master cylinder only feed the airpack and the airpack feed the brakes? If that is true then I'm thinking it has to be some kind of bypassing in the airpack like Jake says.

Used a one gallon pressure tank to fill all the lines and slave cylinders with new dot 3/4 after blowing the system clean with twenty psi air. The Master cylinder was and is topped off. After air pressure comes up you can really stand on the brake pedal and there is no bleed down. Have the...

My M35A2 (77AMGENERAL) when left one or two nights will lose all air pressure. The Brake pedal after the system has bled down will drop to the floorboard when depressed with no resistance. After the truck has started with almost no air showing on the tanks. The Pedal responds after one pump...