63 brake booster questions

Disc brakes require about 50% more line pressure than drum brakes & the booster you have is off a drum brake car. Disc brake cars usually have a bigger booster. You are better off getting a booster off a later model car that had disc brakes. Also, drum brake cars used a Residual Line Pressure Valve which will not work with disc brakes, will bind them up. Usually located in the outlet port.