I took the car for a skid in a gravel carpark to flush old fluid from the
ABS unit, don't know if it worked though. At least the
ABS did.
Best to use a service function I guess, but Forscan doesn't have one as far as I can tell.
I'm still looking at the label on the bottle of Penrite recommended for MC Mondeo Super DOT 4 which reads:
Note: For ESP (Electronic Stability Program) brake systems we recommend Penrite DOT 4 ESP brake fluid.
Given all MC Mondeos have ESP my obsessive attempt to see logic got the better of me for a while.
I think I'm over it now.