PCCB Wear Rates - Page 1 - 911/Carrera GT - PistonHeads UK

Asking for a friend..... For those that have PCCBs, has anyone had theirs measured ? As I understand it, there is a max / min value stamped on each rotor at 120 degree intervals around the disc. These are numbered 1, 2 and 3 with say, 62/38 (these 2 numbers may be different around the disc) - in this case 62 is the value when the disc was manufactured and 38 is the minimum value before the disc has to be replaced. I believe Porsche use a measuring device called a Carboteq ? - to measure the density of the disc. I'd be interested to know your original max/min disc marking, the current value and the mileage your car has covered. So say for example you had an original value of 62 and you'd covered 5000 miles what is the current value (e.g. say 60 - down from 62). Thanks in advance!

Ok, I will change the question a little... Given 3000 miles from new (50% on motorway), how much % wear would you expect on the rear PCCB discs of a 992.2 GT3 At what mileage are you (if ever) having to change rear discs on a never-tracked car?

Sod all. Never due to wear. The construction of the latest iteration of SGL carbon CCB Is vastly superior even 996’s not tracked ran 100’s of thousands of miles.

I also would say almost no wear in that distance. On an older generation of PCCB's I wore out a set on a Cayman R in 34,000 miles and possibly 100 track days ... A carboteq device will measure the wear but this is much better done with the discs off the car and I'm not sure how precise this is ... RPM Technik probably know more about this than most ...

Never tracked car - doubtful you'd ever have to change them (should be good for north of 100k relatively easily). Tracked car - entirely depends. (Mine are around 85% with 43k on the clock).

Tony B2 said: Ok, I will change the question a little... Given 3000 miles from new (50% on motorway), how much % wear would you expect on the rear PCCB discs of a 992.2 GT3 At what mileage are you (if ever) having to change rear discs on a never-tracked car? hardly any. not applicable as you wouldn't need to. or it certainly should be the 2 answers to the above given it's not tracked....

Inferior 996 Gen 1 PCCB's did 180K miles on a road use only 996.2 GT3. Still serviceable at 180K miles too. You have absolutely zero wear and zero to be concerned about. The 996 owner (Rogere) discusses both his high miles PCCB equipped 996 and 997 GT3's here : https://www.pistonheads.com/gassing/topic.asp?h=0&... I can't remember how many miles his 997 GT3 had done (circa 150K I think) but again, the discs were completely serviceable.

That doesn’t make sense. Surely any significant caliper sticking would have made the car awful to drive. In any event, the pads would have taken the brunt of the wear.

OK - many thanks for all of the replies. My friend has just had one of the rear discs (not both) measured at 80% worn, apparently due to a sticking caliper. The other side was fine OPC is reluctant to replace the disc... Edited by Tony B2 on Wednesday 30th September 22:40

Koln-RS said: That doesn t make sense. Surely any significant caliper sticking would have made the car awful to drive. In any event, the pads would have taken the brunt of the wear. I agree. The interesting/strange thing is that the disc in question has very strange shadowy spiral-like marks on its outside surface, which were noticeable on delivery, and have not gone away in 3000 miles of use. I have seen them myself, and they are only on this particular disc, none of the others. If the marks were circular, rather than spiral you might conclude that there was something (a foreign object or discontinuity) in the pad material which was scoring the disc surface in use. But spiral shaped does not make any sense to me. At one point during our recent Euro trip to Italy, I stopped behind him in my Spyder, and I could clearly smell something hot - I was not sure whether it was exhaust or brakes, but given that the previous 2 or 3 miles had all been up hill there was little need to use the brakes at all. I will post a picture tomorrow

Here is a picture of the disc in question. This was taken at ca 3k miles. The marks were also evident on the day of delivery - I am just looking for a picture from then. Given the assessed 80% wear measurement.... ...New question: Has anyone claimed successfully for a new disc, due to excess wear?