Originally Posted by
GraphiteGhost
Over the next few weeks/months (with a progressive aggressive brake application) take the time to check that rotor and inside wheel rim for any sign of a leaking piston. Dave (180) hinted at piston/sleeve damage that may allow rubber ring/scoring forward. Hope it doesn't show signs of leaking but if it does you should be ready to replace the caliper assembly. Good luck!
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Precisely why i suggested blowing the "puck" out with compressed air and inspecting the calipers cylinder. If there had been some damage you might be able to hone it and make it work, but if scratched and put back in service more than likely a replacement will be necessary if it now is found to be leaking.