Why do my brake pedal go to the floor

Sounds you have air stuck in the system, you may need a good scan tool that has brake activation software in it so you can run the ABS system while bleeding the brakes. Or have a good shop do it.

Likely something you did in the brake repair. Peddle to the floor indicates a bad master or lack of vacuum to it. Spongy feel indicates air in the line or low fluid.

Master cylinder has to be " bench bled " You have to bleed it separately from the lines . Don't buy cheap auto zoo parts