I vote you boiled clutch fluid. I did it at buttonwillow, clutch went to the floor and stayed there. It was about 100 degrees out and me and a friend were running the car in back to back sessions. Pulled off the track let things cool down. Pumped it a few times and clutch came back. When I got home I changed to high temp fluid and I noticed the clutch line gets fairly close to the exhaust (I have hfc's which might have contributed to the problem). It even has a little silver sweater on it to protect it from the heat. Other folks may have had clutch failures but if your pedal came back or was fixed with a bleed you prolly just got it too hot.
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