Just went through this and eventually gave up and bought a new to me used caliper and rebuilt that one with success, must have tried to rebuild the other caliper 10 times and couldn't get it to seal, I finally just decided that someone else had scraped it beyond tolerances before it got to me
A pneumatic bleeder from harbor frieght combined with speed bleeders makes bleeding the brakes take about 20 seconds so testing is quick and easy each time I rebuilt and waited for leaks
Just about discouraged
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