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There is a good possibility the piston o-ring seal might leak in the future. I would replace at least the piston and seal.
As for how it got there, I don't know. But that hard plated piston did not become abraided by the O-ring. It must have been rubbing against the housing.
The brake pad wear looks relatively even. They just should have been changed earlier. It happens.
Check the housing closely before rebuilding. A used caliper might not be more than a caliper rebuild kit.
As for how it got there, I don't know. But that hard plated piston did not become abraided by the O-ring. It must have been rubbing against the housing.
The brake pad wear looks relatively even. They just should have been changed earlier. It happens.
Check the housing closely before rebuilding. A used caliper might not be more than a caliper rebuild kit.
