No Bill. The rust was not actually on the working part of the piston. That would render it US.
The rust was in the groove where the rubber boot sits on the piston but given time and lack of cleaning and protective lube creep it would up onto that surface.
The other parts that are neglected are the sliders. Its common for these to seize causing the pads not to release or cause them to wear prematurely at a strange angle. All cured with some cleaning, emery/wire brush and lube.
As I say preventative maintenance. All those components are subject to a very harsh environment.
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