Hello again with the same problem. The car is a 96/960. I have a small wiggle in the steering wheel. This normally comes from the rear wheels if there is a problem with the brakes or rotors. the car had a strong wiggle and vibration when I bought it. I had replaced the rotors and pads then. The wiggles in the steering and vibration disappeared, but now three months later the wiggles have come back when pressing the brakes softly, the brakes hesitate. Everything OK when pushing hard and no vibration when slamming on the brakes at high speed. I have taken the calipers apart and they look fine. There isn't any rust or scratches. The cylinders moves freely.
What could be the problem? Thanks.