Front brake not completely disengaging while driving

It will start out fine, but after a few or sometimes several miles down the road, it will begin to feel like it is dragging and when I apply the brakes, the pedal only goes down maybe an inch and it brakes hard. We have replaced the front pads, rotors, calipers and master cylinder. The current problem did not start until we installed the new master cylinder.
Last week, I replaced the front left pads again because the wore down very quickly and now I'm headed to out to do the same on the right.
Please, any suggestions will be so very appreciated. I'm ready to set it on fire. (Jk)