I have a 20 year old Bosch 10" SCMS that has worked fine over the years, dust collection excluded. About a month ago the blade brake failed to work. I snap-released the switch a few times and that seemed to work for a couple of weeks. Then that temp fix stopped working.

Next I took a pencil eraser and cleaned the rotor through the brush opening until the copper looked polished. No luck.

I ordered new brushes and installed them. I ran the saw for several minutes at a time, removing the brushes in between, until they had formed to match the curvature of the rotor. Still no blade brake.

Any idea where to go from here?