FEBI BILSTEIN Brake Pad Sensor 104920

A wire loop inside the sensor tip sits at the pad's minimum thickness. When the pad wears down, the rotor wears through the loop, breaking the circuit and turning on the warning light.

Replace it whenever the warning has come on, because the worn loop cannot be reused, and whenever it is damaged during a pad change. Many owners replace it with every pad change.

Many European cars have one sensor on the front axle and one on the rear, usually on one wheel only. Check which axle this sensor is for in the product details and fitment information.

Yes, it is usually done during a pad change: clip the sensor into the new pad, route the wire away from moving and hot parts, and connect it. The warning light may need a short drive, or on some cars a reset, to clear.

Compare the part numbers listed on this page with the number on your old part or in your vehicle's parts catalog, and check the fitment information. If you are unsure, contact us with your VIN before ordering.