I was out yesterday for a little run around Cal City. I did a speedy 30 mile race loop and everything was great. I topped off the tank and headed for the hills to do a little rock climbing on my way to Randsburg, this was around 9:30 AM. At the top of the ridge, the brakes were feeling a little soft. On my way down the first serious rock slide, the rear brakes went away COMPLETELY and the front was starting to go. I didn't even think it was that hot out. The brakes cooled over an early lunch in town and seemed to work ok on the way back but I stayed out of the hills and took a speedy route instead. Now what to do? The bike is a good old fashioned 320 pound 2000 XR650R. It may be my fault.....while the pads and rotors have been changed numerous times, the brake lines and fluid have never been changed. I guess I never thought much about it since it always "works". I have run way harder in more heat than yesterday without fail. The rotors are even Braking waves. The only thing really new is the Braking CM46 pads. I have ridden and raced on them three times with awesome results but I have never been rock climbing with them before yesterday. I know little about brake fluid. Can 6 year old fluid just "quit working" (yea I know I should have changed it before now)? What about the brake lines? At 6 years old, should I change them too? Unless the CM46 pads created undue heat at the slow speeds in the mountains, I am sort of bewildered. Any recommendations? What kind of fluid are you DEZERT RACERS using? I am likely to use something Pro Honda.