It goes black i take it? Used to have the same problem on the aprilia rsv, also brembo master on that. What I and a few others did was completely flush and clean the system out, then put dot5 in the system ...... its the silicon type brake fluid, not to be mixed with dot4 or dot5.1 This dot5 worked extremely well, didnt have to change it, it never went black or discoloured in any way and performance was always as good. Its expensive but worth it imo, i had this in the system for over 4 years with no problems, never bleed it and never changed it as its designed to last, does not absorb water like traditional brake fluid, only thing you dont do is put it in the brake system, works to well apparently and the pistons come out to much and can rub on the rotors, this is only what i was told by the other guys who had used it on their bikes for 6 years plus.
