Shazam
http://www.rs200.org/forum/viewtopic.ph ... akes#p2658
Had a similar problem a couple years ago, decided to drain and refill with fresh fluid and then could'nt bleed the bleeding system

tried everything, pressure bleeding, vacuum bleeding and the good old fashion pumping, eventually became apparent that it was a seal problem due to draining old fluid so had to replace both MC's and did the clutch for good measure, did find out that the fluid spills out of vents on hard cornering and breaking over time, leading to paint peeling on front chassis leg and bridging plate.
Claudio