Re: Video link
So, on the previous turn, the brakes were fine, then going into this turn at full speed, ABSOLUTELY NOTHING? No visible pumping of the pedal, no partial brakes, not even a little dive of the front end, just flat a*s NOTHING? If the brakes were getting hot, wouldn't they fade gradually? Or at least have shown some signs of fade before the next turn? You don't head in full speed if the brakes are fading. That means they were fine a turn ago.
Maybe some dirt got in just the right place to prevent pressure from the master cylinder to go to all four of the slave cylinders. Or all the fluid leaked out at once, after striking a rock on the straight.