PCCB Rotors Question
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Haha - he's the best - just PM'd him the same question
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There is no visual method to identify if PCCBs are worn out, under normal conditions, except through a Porsche dealer. Porsche uses a tool that measures carbon content in the rotors which is the only true method to identify if PCCB rotors are worn out.
There are passive temperature sensors embedded in the PCCB rotor that will indicate if the rotors have been exposed to excessive temperature. These are checked as a visual inspection. I do not have any info on inspection criteria, my dealer has always done the inspection for me.
There are passive temperature sensors embedded in the PCCB rotor that will indicate if the rotors have been exposed to excessive temperature. These are checked as a visual inspection. I do not have any info on inspection criteria, my dealer has always done the inspection for me.
Second-generation PCCB discs even feature wear indicators: circular regions about 1cm in diameter at three points around the disc. These wear sacrifcially, so that a wearing disc will develop distinct and precise pits at these points. In addition, wear presents itself as a progressive roughening of the disc’s friction surface and, sometimes, surface cracks around the cross-drilled holes may appear. Strictly speaking, the latter are stress-relief fractures created during production of the disc, but often not visible. Porsche’s technical material states that roughened areas must not exceed 1cm2 at any point, although they may still take the form of extended areas.
Now maybe the PCCB's used in the 997 Turbo are a newer iteration and that wear indicators have been done away with.
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^ the wear indicators are still on the gen 2 PCCBs on the 997TT, Porsche didn't do away with them. I know as the wear indicators on my PCCB rear rotors are beginning to show after extended track use, in spite of my changing the stock pads religiously at approx 50% worn. The culprit is the ever-present PTV and PSM (even with PSM "OFF") which are constantly active and engaged, wearing down the rear rotors.
I will be transitioning to Girodisc slotted 2-piece rotors matched with Pagid Yellow pads on all four wheels, improved brake ducting, stainless steel brake lines and Castrol SRF. This should be solid track set up with adequate livability on the street.
I will be transitioning to Girodisc slotted 2-piece rotors matched with Pagid Yellow pads on all four wheels, improved brake ducting, stainless steel brake lines and Castrol SRF. This should be solid track set up with adequate livability on the street.
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No problem. FYI, most 997TT guys will see accelerated wear on the rear rotors first as the rear brake rotors do not come with ducting (like on the GT3) and run much hotter than the fronts due to elevated temps from PSM interaction. Look at a hard driven track 997TT and note the heavy discoloration on the rear calipers. Hardly any guys put the RS ducting in the rear because frankly they are not aware of the option.
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Shawn C
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Jul 15, 2003 08:47 PM