Dual piston brake caliper Failure frozen solid with rust not serviceable without disassembly which would require a acid dip and complete rebuilding expensive to do.

Ten hours later reveals dipped. Half is as good as new without any compromise to any components what so ever. Disassembly effort is now no more than normal as if the assembly unit was new. Nothing was compromised and is a useable unit again when total unit is de rusted.