I am having the same problem with the first hit being soft then they pump up after that.Last year I did the wilwood up grade on all four wheels. I have the 4 piston setup all around. I am using the factory master cylender which I was told is 1 1/16". Wilwood told me this was suffice. My pads also look like the retract a little to far. I was wondering if you could use a residual or not with disc?