Dimished brake performance. New Pad/Rotor, Rear shoes. Lot of pressure
required to stop, getting worse over time. Car has ABS. Brake system bled,
no leaks at calipers or rear wheel cyls.
With engine off, I can press the brake pedal and it will feel firm and stop
several inches from the floor board.
With engine running (in park, not moving), the pedal goes to the floor.
Is it the master cyl, power brake assist, ABS ??