I have a 17 fe 501 and a fc 450. Both have mugura slave cylinder and both have taken a dump. The slave cylinder is made for mineral oil and is installed with dot 4 or 5 brake fluid. Someone at ktm f-ed up and no one is correcting this. When it goes bad it dumped the brake fluid into your motor oil....this is not good. Go to thumpertalk and read up on it before it ruins your day and motor. Brake fluid does your seals NO GOOD in your motor. Brembo are a update or the clu 1000 from Oberon. Hope this helps...