[lpguitar1]

I just replaced the rotors and pads on my 2002 Malibu. I had moved the pistons back with a C-clamp to make room for the new pads - no fluid spilled from the master cyl., didn't open bleeder valves. When I went to back off the ramps the pedal went to the floor unexpectedly. After pumping the brakes a few times the pedal was firm. The fluid level was OK. I've driven 7 or 800 miles since then and today while I was driving the pedal went almost to the floor then the brakes worked. Then, the pedal was normal, then went to the floor - intermittent. The pedal is firm when it catches, I just don't know how much the pedal is going to move till it does. The master cyl. fluid level is still OK. Does anyone know what this could be? Thanks!