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hippy-
take out brake pads, squeeze lever carefully to bring out the piston a bit, then dose it with mineral oil (using an earbuds helped) around the piston, use a flat headed screwdriver to hold on the piston so the other can come out more.
repeat on both piston, when finish, push piston back in, then clean it as much as you can with Isopropyl alcohol.
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Similar video;
edscoble
I said sticky, not stuck.