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I worked on the truck for a while today. I used an air hose to air up truck and I pressed the brake pedal repeatedly, I actually got the leak to stop. After this it was pretty apparent it was the treadle valve, so I disassembled it in place and cleaned it. There was some grit in it, I used...

I replaced all three with new this morning. In doing so it did fix the leak at the emergency gladhand out front along with cleaning the one-way valve close to the gladhand. I will check out the flowcharts to see if that will lead me in the right direction.Whatever the culprit turns out to...

The problem first arose as I was backing the truck into its parking spot, something failed and air blew off like if you open the valve on an air tank or something the truck lost all pressure and brakes locked. The air is escaping from a vent that comes out of the bottom of the cab. If you...

I have been reading through all of your posts in this thread. I have actually replaced all three of the valves behind the driver step cleaned the one way check valve behind the lower bumper grill and gotten the air leak to the emergency glad hand to stop. In the above quote you referenced the...