I've got dual brakes and upon removal of the header tank, note that one piston on pilot side has a slight pool of fluid around the shaft at the top.
Not enough to overflow down the side and onto the floor. I'm guessing that an o-ring seal around the shaft needs to be replaced and wonder if this can be accomplished in place while still connected to the peddle base. Anyone here taken one of these apart?

Thanks,

Angier Ames
N4ZQ
44hrs