I discovered only through a brake fluid change and disc pad change that my front break lever pivot point had some corrosion . Unless you take the plastic protecter hand guard off you wouldn't know! That worried me a bit, although my brakes were working nicely I'm pleased I know my lever now fully operates in all directions with no sticking. It was only about 3mm of movement but probably enough to cause a problem . Has anyone else experienced this? May be worth checking yours 
