Chosen Solution
1996 Jeep Grand Cherokee V8 after Replacing my master cylinder and bleed the brakes according to RR the LR then RF and LF 3 times. Brake pedal can almost goto floor. After pumping 3 to 4 times better. Bleed master cylinder brake pipe joints and brass connection block for locking front or rear increase of leaks. Could NOT crack brake line joints on the anti lock pump units TWO connection.
There might just not be very much brake pad left, so the pedal almost goes to the floor.