skeematics

I woke up this morning to a "Break Pad Wear indicator" message. Going into the message for details, the car states "Error in the brake-pad sensors". How do i fix this problem without going to the Stealership? Should i be concerned?

FYI, the front/rear brakes are not due for service for several thousand miles.

luigi524td

The error might be triggered by something relatively simple like a sensor than has pulled out of the pad or become disconnected. I'd look for obvious signs of a problem like that first. You may be able to remedy as a DIY or at an qualified BMW indy.

skeematics

Problem went away on its own...

DavidF

Couple of things to keep in mind here:

1. The wear sensor is simply a wire in a bit of molded plastic (or similiar material) that closes the electrial loop. Circuit complete and no warning light, all is good.
2. The sensing pad can be disconnected from the brake pads and hanging loose and the computer would not notice. Loop remains closed, circuit complete.
3. When the sensor pad gets worn away by the rotor (thin pad), the rotor eventually cuts the wire and opens the circuit. Then you get the warning light.
4. The brake pad service indicator is indepent of the wear sensors and is based on mileage and simply a reminder that brake pad inspection or service will be required soon.


If you get random faults, you should look for broken wire upstream of the sensor connection. Happens due to wire fatigue of constantly moving with wheel/suspension. Check to ensure wires are not grounded.