So replacement master cylinder or seals then...

OK... so same seals replaced might well cause the issue to recur, if the cause is the machining of the bore.

If the cause is the spec of the seals, that's harder to understand since brake seals tech is old school.

Either way this is going to run for a while. I wonder if the same m/cyl is used on the Super 3?

DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4