ABS controls at front unevenly with full braking

Hi, everybody, I’ve found a new problem with my thickness, which I can’t rhyme with right now. Maybe someone knows about you a bit of advice. The problem is this: If I put a full brake, the ABS controls the left and right at the front instead of the same both wheels, so that my steering wheel strikes wildly back and forth. The car moves about 10cm to the left and right, depending on which wheel is blocked. 0Kmh still likes to go, but doesn’t want to paint what happens to me if I have to put down a full brake at 160Kmh. I fear that I will then fly off the track. The brakes are made completely and the car brakes absolutely straight out until the ABS procedure. The ABS-Stg. was also made new. What I have also noticed after the brakes incl. brake fluid changes have been made, that the omi loses its braking power over several days and also the brake p If I then repeatedly sharp brake increases the braking power again and the brake pressure on the pedal comes back earlier. Air in the braking system it can not be because the whole system has been ventilated several times and the symtom with ABS and the braking performance described here has passed also before the change of brake discs etc. Gruss Stephan