I have disassembled four of these valves. Each one required a hammer and punch to drive the piston out. And it took a lot pounding to get the piston out. I cannot imagine any of these valves actuating after 50 years. At best they are working as a tee. Just about every original Pantera brake caliper piston is frozen at this point in time from what I have seen. Why would this valve be exempt from freezing?
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