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I can only speak about motorbike, cars disc and drums. Using a brass wire wheel on a drill to clean discs, as motorbike and car brake pads leave a residue on the discs.
The brass is softer than the disc steel so doesn't damage or wear the disc. I also rough up the pads a little the re bed to pad and disc. Am not really sure how to bed in cycle discs and pads.
lynx
Yeah Sandpaper is necessary ime!
My go to with not fucking around with contaminated discs was angle grinder + flap disc, new pads and flush calliper out with disc brake cleaner before reinstalling everything. Only fails when there’s a leak somewhere.