Rear disk conversion issue

Correct. Low when applying brakes. It seems to stop ok…still testing. Has booster bracket and both pedal and pin are adjusted correctly. 95-97 Crown Victoria front rotors, '88-91 GMC 1500 front calipers. The rear rightstuff Cadillac. All new 3/16 steel. Should I clamp the front calipers off at the same time, check pedal? Just looking for some suggestions.