Genuine OEM Audi Brake Pad Wear Sensor, part number 4G0615121C. This sensor contact is designed to monitor the wear level of the brake pads, providing an alert when they require replacement. It is installed on the front left wheel assembly. With a length of approximately 26.8 cm, it offers precise and reliable wear detection. Choosing a genuine OEM sensor ensures accurate signal transmission and durability, crucial for the vehicle's safety systems.