brake help

I have a 73 duster 340 disc front drums in back the pedal would not return back up also the front disc would not release the wheel after pressing the breaks so I replaced the mc which cleared the pedal return problem so I thought the pin's might be ceased because of non use took the caliper's off pin's were loose & free removed the piston's they look clean rust free
checked to see if the brake switch was clear so the pedal could return it seem's good the mc is correct for the car any other thought's as to why the front will not release the wheel after using the brake if I leave the car sit for a day or so the front's turn on till I use the brake