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Perhaps the cost difference between anodizing and painting doesn't make that much difference to companies like Brembo. Anodizing provides a measure of corrosion protection and is, in fact, a thin layer of the base metal (.0005-.003"). Being part of the base material, the anodized layer doesn't insulate and allows heat to dissipate as fast as the base metal allows.
Paint also provides a measure of corrosion protection, but it adds a thin layer on top of the base metal - maybe .0002-.0005", which reduces heat transfer to a certain extent. I imagine the bright colors were more a decision by the marketing group rather than the engineering dept.
Anodizing could be more of a popular aftermarket alternative except for the fact that any ferrous parts of the caliper that can't be removed (e.g. assembly bolts) will be consumed by the anodizing process. There may also be manufacturing and mass-production assembly considerations (cost) when deciding to anodize or to paint.
Sherwood
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