I don't think the ambient temperature matters much for brakes, as their operating temperature gets up to hundreds of degrees. The thing about track use, is that they are used very frequently, with very little time to cool down. During normal driving, they rarely get really warm, as you have to brake many times repeatedly from high speed to make that happen.
I have good experience with ATE fluids. They used to have a fluid called Super Blue, which came in blue and amber colour. Very practical when changing the fluid, as you could see where the old and new fluid was.
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