Anodizing rarely works well on a casting such as a caliper. Typically on a casting it will show a mottled uneven coating therefore as an appearance item is unsuitable. After all, anodic coatings are essentially a dye which relies on the surface consistency for an even coating. But if the caliper is a billet machined part with a nice surface it will work fine. I'd find a similar caliper (casting) that is scrap and try it first to see the results.
+1 on Larry's response to protecting the bores from coating and the reduction in diameter. Anodizing typically is only a few millionths of an inch thick though.
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