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Unless you really do want to road race, don't worry too much about it. My 2010 GT3 RS has 'dead' rotors all around, meaning all show the wear circles...and have for about 7 years now. For street driving, it's not a problem whatsoever. For track driving, it is no longer considered safe. My PCCB rotors have 67k miles on them and still work splendidly on the street, and my car is on it's third set of brake pads with the original discs.
People do occasionally mix CCB fronts and iron rear discs, but I've only seen it done for straight line racing and on the R35 GT-R platform, not 911s. I agree that it's not wise to do, and do not recommend mixing them.
This. Unless you are tracking the car dont worry about it.
Here is some more info from Porsche:
8.5. PCCB brake disk information
The PCCB brake discs require careful handling, they are very sensitive to mechanical influences such as, for example, knocks from the wheel when fitting tyres or damage which can occur when cleaning the ventilation holes with a drill bit.
Mechanically damaged brake disks must be replaced. The PCCB brake disc wear can only be assessed by weight loss, and not, however, by the reduction of the brake disc thickness. The wear indicators on the brake disc are not relevant for use when racing. Precision weighing scales are recommended to weight the brake discs. The weights should be documented together with mileage. To guarantee precise documentation of the brake discs the new weight of the brake discs and a sequential number are engraved on the disc bell.
The brake disc weight loss must not exceed 100 g from the new weight. If the weight loss exceeds 100 g the brake disc is worn out.
119
The brake discs must be free of brake dust, rubber particles and other dirt before weighing in order to make an accurate assessment of the wear. The brake discs must not be taken apart. The PCCB brake disc must be carefully bedded-in when new in order to achieve a long lifetime and high brake performance. A brake disc temperature of 250° C must not be exceeded. The brake disc surface aspect changes from matt to shiny after bedding-in. It should be noted that all four brake discs are bedded-in evenly on the car. To achieve even bedding-in slightly more brake force must be set to the rear axle.
Hi guys,
What a great source of information you are!
Thank you for all your replies, special one to RAudi Driver for the documentation.
I suspect that the mechanics from Porsche Centers are not all well trained for PCCB application.
My rear discs are shinny and smooth with no surface damage but the little 2 cents rounds wear indicators appear. => They recomended to change the set of discs!
My front pads are totally worn and not parralel to the disc. The down side of the pad is gone (mean i'm on the steel plate!) while the upper side still has 6 mm of pad material remaining.
Should i suspect a problem on the caliper or it is normal?
Based on all your comments i will keep the full PCCB set on the car.
The uneven pads are normal, usually you should check and flip them every 5-10k miles.
Here are a pic of a set .2PCCB that I have with 2k miles on them. You can see the dime size indicators...
Originally Posted by FredtheFrog
Hi guys,
What a great source of information you are!
Thank you for all your replies, special one to RAudi Driver for the documentation.
I suspect that the mechanics from Porsche Centers are not all well trained for PCCB application.
My rear discs are shinny and smooth with no surface damage but the little 2 cents rounds wear indicators appear. => They recomended to change the set of discs!
My front pads are totally worn and not parralel to the disc. The down side of the pad is gone (mean i'm on the steel plate!) while the upper side still has 6 mm of pad material remaining.
Should i suspect a problem on the caliper or it is normal?
Based on all your comments i will keep the full PCCB set on the car.
Unless you really do want to road race, don't worry too much about it. My 2010 GT3 RS has 'dead' rotors all around, meaning all show the wear circles...and have for about 7 years now. For street driving, it's not a problem whatsoever. For track driving, it is no longer considered safe. My PCCB rotors have 67k miles on them and still work splendidly on the street, and my car is on it's third set of brake pads with the original discs.
People do occasionally mix CCB fronts and iron rear discs, but I've only seen it done for straight line racing and on the R35 GT-R platform, not 911s. I agree that it's not wise to do, and do not recommend mixing them.
You've gone through 3 sets of pccb brake pads in 67k miles? Isn't one set rated for at least that?
996 pccb's are gen 1 composition and 350mm, 997 are second generation and 380mm. You can also tell by the veins and hole patterns when comparing 996 to 997 pccb's.
You've gone through 3 sets of pccb brake pads in 67k miles? Isn't one set rated for at least that?
I bought the car 7 years ago with 59k miles on it and have the service records. This is the third set of brake pads but still the original discs. The car was on track a few times in its life before I bought it, so that may have accelerated brake wear considerably.
03-02-2020, 01:48 PM
