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Hello Wieger and thanks for sharing your findings, odd as they may be. You measure that you have in fact worn the discs (37.6mm vs 38mm when new), yet you also mention "heavier than new" when weighed. Not sure if there is an error or not in either measurement (thickness or weight), but they seem to contradict each other. Perhaps use another scale or micrometer?
Weighing the discs is somewhat subjective in the sense that many variables come into play, among them, residual matter (dust) which could affect the final outcome, but it appears as if you have taken care to make sure this is not the case. You mention "after drying", so perhaps the discs were not as dry as you thought and they did in fact absorb water, thus the high weight reading? Just throwing out ideas.
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Now: 2013 Cayenne GTS
Ex: 1999 C2, 2004 Cayenne Turbo, 2002 C4S, 1999 BMW M Z3 Coupe, 2013 Audi RS5
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