I was at the track the other day. The ambient temp was close to 90F track was at 125-130F (measured).
The car ran fine, no breaking issues anywhere on the track. Once I parked my car and went around to check tire pressures I noticed that I had break fluid leak from the bleeder nut on the caliper. By the time I checked it, it was already all white and sticky (we made a few dirty jokes lol). But on a serious note, nobody knew why this has happened and if it could be some kind of problem!
I did two full days of track days in similar but not as hot temps the weekend before and this has not happened.
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