When I worked at the Poscheshoppe, working on Posche's and BMW's we did a little trick to keep the brakes from squeaking. We did this on every brake job that we did. Take some duct tape and put it on the back side of the pads, where the piston hits or were it touches medal. It works better than brake quiet and will last as long as the pads.
I did this on mine and drive gravel roads and no noise. Just a thought.
I did this on mine and drive gravel roads and no noise. Just a thought.