The Bowa Brake Pad Wear Sensor - A059013 is a small electronic device designed to detect when the brake pads on a vehicle are worn down and need to be replaced. It is compatible with a variety of vehicle makes and models, and is easy to install. The sensor works by monitoring the distance between the brake pad and the rotor, and will send an alert when the pad has worn down to a certain level. This helps to ensure that the brakes are always in proper working condition, and can prevent potential accidents or damage to the vehicle.