Registered Forum User
500SD
Posts: 640
Join Date: Aug 2003
Location: Caterham, Surrey
Mood: Christ been away too long....
I had a prob with the rear master cylinder on my ST, It was cured by blowing out (into) the master cylinder as crap had got into it.
It wasn't exactly the same prob as yours as it caused the rear pads to not release (fluid wasn't being released back into the reservoir).
The guys at On yer Bike sorted it for me.