Genuine OEM Audi Brake Lining Sensor, part number 4M0615121P. This critical safety component is designed to continuously monitor the wear level of the vehicle's brake linings, providing an early warning to the driver when brake pad replacement is necessary. It is typically installed on the rear brake assembly. This sensor, weighing 0.024 kg and measuring 0.38m in length, ensures accurate and timely data transmission. Using a genuine OEM sensor guarantees precise calibration and reliable communication with the vehicle's onboard systems, preventing premature wear or unexpected brake failure.