GM drum to disc swap
Swapped from drum to disc on the rear of my race car. Limited to stock parts, and used the calipers from the front of a Caprice wagon '85 model. Used manual master cylinder, with no proportionary valve. Problem: no pedal without pumping several times. Minimal pedal with numerous pumps. Not enough to stop car. Need stock combination to allow me to utilize the rotors I have. They are after-market .81 thick, purchased from Speedway Motors and are the only part I can use that is after-market. ANY and ALL assistance appreciated.........thanks.