So we get ready to go riding and the day before I notice the front brake on 250F is not working at all. I pull the caliper and check it all out and nothing is frozen, there is simply no brake pressure. I tried to bleed the line but that is a joke with the small amount of lever movement. 
There was no pressure coming from the master cylinder so I call 3 Yamaha dealers and none of them have a rebuild kit. 
I call a small shop in my area and he says to bring it in and he will have a look. Turns out there was some small air bubble in the line but the main problem was the master cylinder was all gummed up and dirty from old fluid, etc. He spent close to 45 minutes bleeding and flushing the system until it worked perfectly and charged me $25. I now have a new place to go if and when I need something done.
There was no pressure coming from the master cylinder so I call 3 Yamaha dealers and none of them have a rebuild kit. I call a small shop in my area and he says to bring it in and he will have a look. Turns out there was some small air bubble in the line but the main problem was the master cylinder was all gummed up and dirty from old fluid, etc. He spent close to 45 minutes bleeding and flushing the system until it worked perfectly and charged me $25. I now have a new place to go if and when I need something done.
Dont forget free autographed receipts!