New here, picked up a 2017 958 about a month ago. The break wear indicator turned on last week. Is there a way to tell if it’s from or rear brakes that need changed? Or do you have to pull the wheels and inspect?
I’ve changed plenty of pads myself, but never with sensors. Anything I need to look out for? Do the sensors automatically reset with new pads?

 

Once the sensor is tripped it's going to require a replacement of the part. Recommend you pull the tires off and use something like this to check wear front and rear.

 

Just did this - better to pull a front and rear tire to check. I would guess it is the fronts, mine were essentially on their last legs - but I drove around 500 miles after the light and message came on. Interestingly, the pads I pulled off were Akebono, which I have been unable to find as a desired replacement. The pad replacement was pretty straightforward - spent considerable time cleaning the caliper. Also changed rotors - good price at dealership parts. It took some rubber mallet pounding to get those off - likely original. Car has 63K. Took me 3 hours longer than it should have, but happy with the repair. Rear rotors are in great shape, so plans to just do pads in the rear,

If it is the rears, you may have to go through a "grinding in" procedure with a scan tool... Will find out about that later today - then on to oil/filter and transfer case service. Certainly opportunity to save $$$.