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Probably best to just leave the system alone, flush it thoroughly, & replace all the wheel cylinders, shoes, and MC. The pinion parking brake might be useful as a backup emergency brake as well, even though it's not designed for that. But if the system ever did fail it would be nice to have...

What's the approximate stopping distance on dry highway from say 50 mph assuming the brakes are in good working order? I'm just curious.

Ok, half the area. With the same pedal displacement, that is pushing the brake pedal all the way until it bottoms out on the floor, you are still only moving 1/2 the volume of brake fluid compared to bottoming out the original master cylinder. Unless you plan to keep the brake shoes new &...

But Chuck, with twice the plunger travel on the MC you will still have to modify the pedal. Otherwise when the pedal is pushed flat to the floor, the MC plunger is only 1/2 pushed, and creates only 1/4 of the volume of fluid displaced as before. That doesn't sound safe to me. The force on...

Chuck that's true, But 3x the force wouldn't be that difficult to accomplish with a modified pedal. It's just a lever after all. "Give me a long enough lever and a fulcrum on which to place it and I shall move the world" ~ Archimedes A modified pedal could be made to have the exact same force...

If you're going to custom mod a dual master cylinder setup, why stop there? Heck, make it a 3 master cylinder setup. Run extra hard lines to the rear-rear if needed. That way you don't have to worry about proportioning valves at all. And you would have triple redundant brakes.:razz: Just...