The Pagid Disc Brake Pad Wear Sensor Set - 355251211 is a set of sensors designed to detect when the brake pads on a vehicle are wearing down. These sensors are specifically designed for use with Pagid disc brake pads and are compatible with a variety of vehicle makes and models. The set includes two sensors, one for each side of the vehicle, and they are easy to install and replace. When the brake pads wear down to a certain point, the sensors will trigger a warning light on the dashboard, alerting the driver that it is time to replace the brake pads. This helps to ensure safe and efficient braking performance.