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

That verified the brake master cyl push rod, the longer you drive the vibration is coming from the heat, the pads are clamped on the rotors, the soft pedal is coming from the fluid boiling in the caliper. leave the brake hoses alone and work on the pedal push rod, and the master push rod.