I bought my bike from my brother in law after he spilled it going about 40 MPH. He only had it 2 weeks. Damage to the bike was minimal, windshield broke, highway pegs snapped off clutch lever scraped up, right rear foot peg/muffler bracket broke.I have all of the above changed out and repaired. Tank didn't even get a scuff. My brother in law not so lucky. Major knee reconstruction. Healing. Now for the cause of the spill....First of all I am no authority on the repair subject. On the other hand I have never taken a vehicle to the garage to have it fixed. He told me the front brakes locked up on him. I got the bike home and opened the master cylinder, full of rusty sludge and the return port was crystalized and caked shut. I disassembled the master cylinder, cleaned it thoroughly removed all the lines, disassembled the calipers and cleaned them. I had to rod out the small opening in the master cylinder. I called my closest Kawasaki dealer and asked if I was on the right track. He graciously said yes. I fashoned me a vaccum catch jar with two fittings on top to attach to my vaccum pump and to the bleeder screw on the calipers. I vaccumed new fluid through the system and let it purge a little extra. I caught all the yuck in the jar. Works like a charm. Kawasaki told me it was a result of poor maintenance and moisture had built up in the system. They recommended changing out brake fluid every year or so...I hope this helps someone avoid an accident.