I did some searching here and elsewhere, but have been unable to find a good solution to an issue I've had with my floating single-piston VW brake calipers over the years.
I replaced brake pads recently on my Passat, and one thing I now do whenever I replace the pads/rotors is to clean the caliper carriers at the surface where the pads are held. I've had pads hang up before to where only the piston-side pad would then make good pressure on the rotor. Cleaning these guides should so that the pads are free to move should have resolved that. I also remove the caliper pins and clean and grease them every time I replace the pads or remove the calipers for other service work.
But, I still have incomplete contact of the pads on the rotor. The innermost portion of the pad (closest to the center of the rotor) does not seem to be providing braking power. The rotor is rusted at that innermost portion of the pad contact area on the rotor. On the outermost portions, the pad is making good contact and the rotor is rust-free, shiny and clean. I've had this and similar issues with single-piston floating-caliper VW brakes over the years and am wondering what else I need to fix to get proper braking performance.
I do not have this issue on my wife's Volvo V70R, for example. But, her car uses fixed calipers with pistons for the pads on each side of the rotor.
I can't believe that I am doomed to a life of incomplete brake power in my Passat - what's the solution here?