ABS rings

For any car work in combination with sensors to provide information to the Anti-lock Braking System controller about the road speed of the wheels. If one or more wheel is found to be out of sync, the ABS controller applies pulsed hydraulic pressure to prevent the wheel from locking up.
A faulty ABS ring will result in a warning light being lit up on the dashboard, and is an instant MOT failure. To ensure your ABS rings are effective and safe, buy only good quality.