Told this story on the scat site...
Some years ago I took up road racing (like on crotch-rockets) with some friends of mine. Buddy sold me his track bike, a CBR900. That model came with an uncommon front wheel size, but was a great track bike otherwise, so it was very common to swap the front end from a GSXR750, which my friend had done.
The decision that almost killed me was to buy, and start racing, this bike but temporarily leave it in the care of my buddy. So I hadn't yet possessed the bike, done the maintenance on it, anything like that. So I didn't notice that one front brake line (these bikes have dual brake calipers, one on each side of the wheel) was rubbing the tire, but only when the forks were very compressed. Of course the forks compress quite a bit every time you get hard on the brakes, but at rest the brake lines looked fine and were routed where they should be.
The track we rode at had one long straight, at my skill level I was typically at about 135 mph when I hit my braking point at the end of that straight. During my third or fourth ever track day I grabbed a big handful of front brake at the end of the front straight, going about 135, and the lever goes all the way to the grip with zero resistance. I have no brakes. None at all. Right at that moment I was sure I was going to die.
Obviously I didn't, I just went off the track into the mesquite and sagebrush going 135 mph (another life saver was this track had tons of run off and no barriers of any kind unlike many similar facilities where I would have t-boned a concrete barrier). Maybe years of off road racing and riding helped, I don't know, but I stayed with it until I was down to about 20 mph or so, the suspension bottoming so violently I heard metal-on-metal clanks, at which point I just deliriously let go of the bike in a swan-dive like motion.
I pick everything up and make my way back to the pits where everybody is waiting for me. Oddly, or not, I could hardly contain my laughter and kept breaking out in a teen-girl giggle every few seconds. Enjoyed about 30 minutes worth of adrenaline-serenity, or something, because I didn't die.
that's all I got
edit to add: rear brakes on these bikes don't do much but I did hit it (and had the presence of mind to downshift like crazy), and it should be obvious that point of failure was the tire eventually rubbed a hole in the brake line.