Yes, you might have cooked the pad, especially left foot braking. If you were resting your foot on the brake pedal even the slightest, you could have been adding frictional heat.
I've "been there, done that". Calder, 240Z, stock brakes. Million miles an hour down front straight, into 150 m, STAND on picks, sideways into turn 1. Next time round, same thing - Oh Shoot! hard pedal, absolutely no retardation. Good thing the gate was open on the escape road!