If it was a hydraulic problem then opening the bleeder at the wheel cylinder would release the brakes on that wheel at least whether the blockage was caused by a master cylinder fault or a restricted hose.
Yes, it is possible for components to corrode over time even if assembled with rubber grease. A lot depends on the quality of the grease and atmospherics.
I don't know the exact brake set up that is causing problems here but running the adjustment out and back may do nothing to retract the pistons.
David
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Hell no! I'm not that old!
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