Hi,
I'm in the process of building up my freshly repainted S. Next step is the brake calipers. It seems the alu. front calipers are fine, except for a small corroded section, on the edge with the "hole" where the piston sits. I guess the usual problem (between alu and steel), but what to do with it? Sanding the area and put blank paint on it?
The rear ones I would like to restore in gold-passivated finish. Do I need to take them apart (and refresh the O-rings), or keep them intact and put them to "bath" as a whole unit?

Thanks for the response!