The Pagid Disc Brake Pad Wear Sensor - 355251191 is a small electronic device designed to monitor the wear of brake pads in a vehicle's disc brake system. It is typically installed on the brake caliper and works by detecting the distance between the brake pad and the rotor. As the brake pads wear down over time, the sensor will send a signal to the vehicle's onboard computer, alerting the driver that it is time to replace the brake pads. This helps prevent damage to the brake system and ensures optimal braking performance. The Pagid Disc Brake Pad Wear Sensor is a reliable and essential component for maintaining safe and efficient braking in a vehicle.