I think they make caliper rebuild kits may just be a bad seal or dust boot. I don't do brake jobs involving more then rotors, pads, and caliper pins, but a maintence tech here said that on older calipers the pistons could be dirty from the brake fluid building up over time. So to wrap it depending on how mechanically inclined you are I don't see it being to bad of a job, but I wouldn't do it.
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