Consider the caliper as potentially damaged if the pads wore to metal. If the rubber dust boot around the piston is torn they may work but will soon fail as water gets in and begins corroding the bore. If the piston doesn't slide easily, they are probably shot. Rear brake calipers on some cars (Fords) incorporate a ratcheting adjuster for the hand brake. They seem to fail before the hydraulics do. Inspect them for unusual wear or corrosion.
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