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Apparently, there is very minimal clearance between the PCCB caliper and the inside of the wheel. I guess these sticky tires throw rocks all over the place and there’s a good chance one of them will bounce into the inner part of rim and scratch the crap out of the caliper and inner wheel. Did some “Google research”, and I guess this is a common issue with the PCCBs given minimal clearance between the caliper and wheel.
Both the front calipers and wheels have similar scratches. None on the rears.
On a good note, this was the inaugural lift for the Quick Jack, and it worked like a charm!
Quick Jack is awesome! Caliper scratched up Inner wheel scratched up
I know this is going to sound stupid, but I have the iron rotors and went to 19” track wheels, and the clearances are probably worse than PCCB on 20’s.
Before I had forge lines, I had a similar issue with my BBS 19’s. What solved it was doing a layer of ceramic coating on the calipers. Helped reduce the buildup of gunk that seemed to be causing the issue.
My GT4 that i bought has this same issue but is worse than yours. No real damage to the wheels but the top side of the calipers are all scuffed up. I am trying to figure out a way to touch them up.
Same here. Rock gets stuck and cuts a perfect groove in wheel. Geesh....I thought I was the only one this has happened to. Surprised to find out it is a common issue.
Common on my car with PCCB's. I can normally hear it pretty quickly and just stop, back up 4 feet and then go again. The wheels are about 3/4 of an inch thick there. Not an issue other than the groove.
This is a much more common problem than I ever knew before I bought my GT4.
I have a 981 GT4 with PCCBs, which I bought about eight months ago. In that timeframe, I went through four front wheels due to rocks being thrown up and getting caught between the caliper and wheel barrel. In my cases, there were scratches through the paint and into the aluminum wheel. Depending on who I asked, some people felt it was a liability on the track due to the risk of a possible wheel fracture with track stress. I’m not sure I believe that, but I had a couple people tell me that they would be nervous tracking the car with wheel damage. This probably represents only cosmetic damage, but it’s impossible to know with certainty.
The first two wheels were replaced when I bought the car from the dealer, so that it could be CPOed. The next two wheels happened on the street, one of which was replaced by Goodwill by the Porsche dealership, and the other through the Porsche wheel and tire warranty. However, they told me that they would not replace any more wheels through the warranty.
Since I started having this problem, every time I go to a car show I look at every Cayman and 911 with PCCBs. Probably about half of them have these scratches.
The only way to prevent this from happening is to purchase wheels that are built for a big brake kit. I bought 20” HRE P101s for a pretty penny, but have had no issues since. The clearance isn’t huge, but enough that I doubt there will be a future problem. I know others buy Forgeline or BBS wheels, which supposedly have similar success.
Reason #3 why I didn't order PCCBs on my new GT3. Sorry to see this. Would drive crazy. Beautiful car & color. Nice lift. I'll need to look into one of those later this year.
Clearance is definitely tight. This is on my Panamera turbo S hybrid. I wonder if this is covered by warranty. I very much doubt it but I will give it a try in the morning with the dealers.
Found these thread after I installed new tires yesterday and same the calipers are pretty scratched up.
good to hear it is normal
I checked the wheels and I didn’t see any damage
02-15-2021, 09:31 PM
PCCB Scratches.
