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Thank You! With the caliper removed (or just loosened), the spring easily moves the arm/pad back on its own. The piston/pad is not noticeably retracting back into the caliper when brake pressure is released. I'm now wondering if a new seal is needed. Sounds like caliper disassembly/inspection would be a good thing...
I do a final check with any hand mastercylinder when it's all set up.Crude but effective, squeeze it with both hands as far as it'll possibly go a few times, until it feels like everything is bending, really severe then hold a hand behind the twist grip and hit the ball end of the lever in multiple times to pulse the whole system in a controlled violence During this the lever should repeatedly give the same travel, neither lengthening or pumping outward. All the seals working properly should give absolute consistency under this routine. Any real variables and you'd have to examine why that's the case.Sounds severe, but properly puts far more elevated pressure through it than any normal use, and always verifying if there's any likely problem.Final check, after that, roll the wheel to assess release, it should not bind at all after the above. Then ride it to see what ya got.I do this with every front brake I work on.