Is this seriously legit and OK to do?? After all the things I have heard about being careful contaminating your rotors and all the things that can go wrong with them...seriously just take sand paper and go against the grain?? Seems wrong without ever doing it, but I actually have a bike I can try this on. I am in similar spot...changed pads multiple times, clean rotors neurotically, and the squeak always comes back. I didn't even know what to do or think anymore about it and just learned to live with it looking forward to a different system one day. This is the only other thing I can try before new rotors and I wasn't going to spend the money on new rotors to find out if that will fix it.
From the article:
Do not breathe the powder coming off because it might contain asbestos. Probably not, but don’t risk it.
Is there? Should we/I know?