This Protex Brake Pad Wear Sensor replaces the original equipment unit on BMW 3 Series models built from 2017 to 2021. Brake components should always be replaced in axle pairs to keep braking balanced. Every unit is pressure tested and inspected before packing. The Plastic construction is corrosion protected for long service life on Australian roads. Check the fitment list against your build date and VIN before ordering, as running changes were made mid-generation. We recommend fitting by a qualified technician and following the manufacturer's torque specifications. Fitting is a straightforward workshop job and no coding or calibration is needed. This part is a common wear item on high-kilometre Australian vehicles and is worth replacing in pairs. Packaging and labelling include the part number and application data for easy stock control. Sold new with 36 Months warranty cover and full technical support.