Hello guys;
I made a new bleed of the brake lines, now i'm sure there is not air inside the brake system! Unfortunately my problem is same! I push the pedal absolutely no brake, (alarm light brake on). After 15 to 20 pedal strokes the car brakes almost normally with a stronger force difference in the rear (brake light is off). Back home again the pedal goes to the bottom...!
I noticed when I was bleeding my brakes (after installing my new master cylinder) that the rear reservoir is pushing or bubbling up fluid when I push the pedal (kick-back of fluid into the reservoir). Its not air bubbles but fluid pushing up into the reservoir and sometimes even coming out of the reservoir. The front doesnt do that ! Is this normal ?

Thanks again !