– ABS speed sensors are devices fitted to a vehicle's wheels to monitor wheel speed, which is then relayed to the vehicle's ABS system. – The ABS system uses this information to reduce wheel lockup and improve vehicle stability during braking. – The ABS speed sensor is responsible for detecting the speed of the wheel it is attached to. – The sensor sends a signal to the ABS system, which uses this information to determine if the wheel is locking up. – If the wheel is locking up, the ABS system will reduce brake pressure to that wheel. – ABS speed sensors are typically made of plastic or metal and are located near the wheel's hub. – They are exposed to high levels of stress and vibration. – As a result, they can fail over time and need to be replaced.