The Bowa Brake Pad Wear Sensor - A059112 is a small electronic device that is used to monitor the wear of brake pads in a vehicle. It is designed to be installed on the brake pads and is connected to the vehicle's onboard computer system. The sensor measures the thickness of the brake pads and sends this information to the computer, which then alerts the driver when the brake pads need to be replaced. This helps to ensure that the brakes are always in good working condition and helps to prevent potential accidents due to worn out brake pads.