I'm a little late to this thread, but if the brake bias is off and you need to rework the pedal to master cylinder assembly, there is a device called a brake balance bar used in racing where different master cylinders are used front and rear. The master cylinder push rods are linked to te pedal by this threaded bar. By turning the center balance bar it adjust what percent of pressure is applied to each master cylinder. There are also remote knob kits to adjust the bias while driving.
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