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You need to take the piston completely out, so either keep pulling to get it out, or yes used compressed air thru the bleeder port. BE CAREFUL as the piston will come out hard, watch your fingers!

Once out the caliper should be fine, they're aluminum. Just scrape out all the crap with brushes and dentist picks --- be sure the clean the groove where the seal goes!

Hand polish the piston with some polishing compound or chrome polish, it should clean right up. All you should need is a new seal and maybe dust cover. The calipers and pistons seem to never wear out beyond use, unless there's deep scars in the piston...

Lube the piston and newly installed seal with a little brake fluid and press it in. Good to go!
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