Brembo Brake Pad Wear Sensors are designed to keep driver aware about the vehicles brake pads remaining life and when they are due for replacement. The electronic wear sensor monitors the brake pad thickness on your vehicle and sends a signal/warning that your brake pads are at minimal thickness and need replacing. Made to OE specifications, your new Brembo brake pad wear sensors will perform exactly like the original wear sensors on your vehicle. Brembo strongly recommends replacing the wear sensors with every brake pad replacement.