Now that I've invented numerous new cuss words in a variety of languages I'm out of ideas. The boost runs off a seperate aux pump on the side of the engine. After contacting the factory I was told to check output pressure from the aux pump and it was a little low so I changed the pump with the same result: no brakes with engine running. The master cyl and boost are an assy and short of disconnecting and plugging the hyd line that goes directly from the pump to the boost (which could damage the pump) there's no way to bypass the boost. There is no relief or pressure ports in this system that I can find visually or by schematic. We tried adjusting the cyl. stroke plus and minus to no effect. We even double checked the prime on the pump to 600rpm and tried bleeding the brakes with the engine running...still no air coming out from the cylinders and no brakes. If anybody has ANY ideas please help as the dealer, factory and I am out of ideas.