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clementli
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Hi Guys, I am not new here, but then this is my first reply, since this topic is one of my interest as well. I am a assistance mechanic of a Porsche tune shop in HK, and I have seen many many PCCBs going through track events, all 3 generations!! I've even seen blown PCCB discs too, but my experience tells me that the problem does not come from the Disc itself. It's the pads. The PCCB disc itself should not change the thickness since this is different compound than disc that it does not wear the thickness, but apprently, when PCCB wears out, its surface slowly peal off. But the killer of the PCCB discs at low milage is the brake pads. The pad itselves are friction metal mounted on the metal plate with some studs sticking out from the plate if you understand me, and these studs sticks out to about half of the friction materials, and that's the problem, since when you worn your pads half, these metal studs are actually scraping directly on the PCCB disc and cause damage. That's why our customers in HK never use the lower half of the brake pads. And we have found out that the rear pads has more wear in 997 GT3 RSs as well (on track drives), I am not sure why but it seems that it is the majority, so I suggest that if you wish to protect your PCCBs, use check the pads level very very constantly and do not use the second half of the pads!!! Hope this helps!!