Hy PhilBurban, I helped britcon with this project, the master cylinder [Raybestos 36468] is a 1 1/8" bore designed for a 1976 Tbird with four wheel disc brakes. Britcon has a residual pressure valve, and an adjustable proportioning valve in the rear circuit. The master cylinder mounted to the same booster as the smaller bore one it replaced. Part of the problem with britcons system was that his brake pedal could not go all the way to the floor because of interference with the steering column, hope that helps.
