Brake help please

Yes it had power brakes before. I've never driven a long distance with the car. I'm talking 10 miles at a time.

Here's why I changed pads rotors calipers:
Start of drive would be fine and brakes worked. After a few miles, the car would get a vibration. The brakes would be very soft with the vibration really noticeable in the pedal.

I bought rotors, pads. When I tried to put them on both sides the piston would not go in. Got new calipers. Install went great.
You know the rest of the story