For a 2004 BMW 325xi Do you need to change the brake pad sensor when you change brake pads?

Answer 1

You shouldn't have to unless you bought aftermarket pads that don't have a location for the wear sensor, but even in that case you wouldn't need the senor so...no. The only time when you need to change the sensor is when your brake light came on on the dash, hence the sensor has been used and is now ruined. Under these conditions, yes you should replace them. It might be possible to either clip the wire close to the end and tie the two wires together if you just want to get rid of the light on your dash, but this is slightly danagerous if your selling the vehicle to someone else. -Brake Engineer You shouldn't have to unless you bought aftermarket pads that don't have a location for the wear sensor, but even in that case you wouldn't need the senor so...no. The only time when you need to change the sensor is when you brake light came on on the dash, hence the sensor has been used and is now ruined. Under these conditions, yes you should replace them. It might be possible to either clip the wire close to the end and tie the two wires together if you just want to get rid of the light on your dash, but this is slightly danagerous if your selling the vehicle to someone else. -Brake Engineer