I have a Wilwood front disc kit (11" rotors with aluminum 4 piston calipers) on my 59. I am using a manual disc/drum master cylinder meant for a Maverick, and it has been fine for the 2 1/2 years that I have had the car on the road. Obviously the pedal effort is higher than a power brake equipped car, but not at all objectionable. It`s been about 6 or 7 years since I drove the car with it`s original manual 4 wheel drum setup, but I doubt that the manual disc setup is harder to press the brake pedal down, the the factory setup.