ABS regulates at every braking shortly before stand

Hello! I am still at the Arosa 6HS in troubleshooting and repairing. Saturday I have renewed the wheel speed sensor indicated by the VCDS at the front right, ABS works…. …but it rumbles at every braking just before standing. My guess is, the ABS sensor ring is damaged and gives uneven impulses. Can you replace this ring? Greetings Sepp