I did wonder, as I was braking into the first bend of the next session and finding what appeared to be reduced braking effort, if the pads had gassed a bit and left a film on pad surface, but having now put in an evening on track and over a hundred road miles i'm sure that must have clean up the pads again.
Any thoughts? Boiled fluid?? (but presumably that would condense again and return to normal?) Tired lines?
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Rallye-RNurburgring article