· Premium Member
One of two things. I believe there are two small plates with three holes drilled in it that is needed at the brake pedal itself. The top hole attaches to pivot point on the brake pedal support, the second hole attaches a rod to the brake pedal and the bottom hole is the master cylinder pushrod. This gives you the extra leverage for the larger pistons and same pedal movement. I had the same problem with my 68 Charger when I converted to power booster, I had the parts readily avialable, but I might be wrong, this was a B body system and you have an A body system, but this would explain the extra pumping necessary. Hopefully someone else will chime in, I don't have my shop manual handy to verify.