Front Axle Brake Pad Wear Sensor for BMW 1 Series F20 3 Series F30 F31 34356792289. For BMW 1 Series F20 3 Series F30 F31. Compatible OE/OEM Number: 001130 20939138 0834187 F31 F31 F35 F21 F21 F20, 20939138 34356792289 39751 WI0751 39138 3145270020, F22 F87.