Re: 69 Brake Booster Pins
Well I've ran into an issue. With the short rod inserted into the booster and the "spud" inserted in the master cylinder, the mounting flange of the master cylinder will not mate with the mounting surface of the booster. If I push the master cylinder against the booster flange, I can feel the piston in the master cylinder depressing. If I installed it like that, I would have locked down brakes from the get go. The master cylinder likes about .100" from seating to the booster. I have ordered one of the booster pin gauges and it's obvious I will need to make an adjustment. Instead of trying to shorten the booster pin and get the correct radius back on it, I think I will probably have the "spud" machined down on it's non-concave side. I've read that there needs to be .020" clearance between the master cylinder piston seat and the booster rod. I would think that with today's CNC machining and precision, aftermarket parts manufacturers would have everything exact in dimensions. It's obvious the mismatch between my booster and master cylinder is either a manufacturing error or their blueprints are wrong to begin with. It seems like most of the time with reproduction parts, I have to "make" them fit or work correctly.