I am converting a 74 nova from front drum to disc, I bought a master cly and prop valve from classic performance, and factory nova rotors mounts etc, reman calipers from autozone new caliper hoses also. I bench bleed the master then bleed the system and I have no brake pedal, just goes to the floor. If I pinch the three rubber lines I have a solid pedal, if I remove the clamp off the rear line still have a solid pedal, but when I remove the clamp off of both or either front line the brake pedal goes to the floor, so then I took the calipers off the mounts and put a c clamp on and pushed the pistons all the way in and left the clamps on, the pedal still goes to the floor, with e clamps still on and I pinch the front lines, solid pedal. I have no leaks calipers and mounted correctly with the bleeder screw on the top. Any Ideas????? my guess is bad calipers from autozone, but to get two bad ones at the same times, the odds have to be high.