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About a year ago I converted my 69 C/10 over to 71/72 disc brakes by replacing the front crossmember, however the brakes have never felt right since. The booster is the one the was working fine when the truck was drum/drum, and do not feel that it is the trouble. I have a new 71 / 72 proportioning valve, a new master cylinder, but still have excessive play in the petal. The first master clyinder was a Raybestos 2 bail, this caused the brakes to stop slower than desired( not sure if it was going to stop or not ), and unable to lock up under extreme braking. I also tried a Bendix Master Cylinder, this one works better, but made the brakes extremely touchy ( brake petal would travel about 2 inches with out stoping, and would instantly lock up). If anyone has had the same trouble, pr any sugestions, it would be greatly appericiated.