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Yup tons of variables when it comes to these PCCBs. The 997 crowd often change them to iron rotors due to cost (mostly tracked cars). Others swear no use in 60K+ miles. Then others do say that on Cayennes, they are expecting to last 100K miles (not lifetime). Others have only gotten 75K miles. A lot has to do with how they are used and what vehicle is equipped with them.
Cayenne I'm considering has ±58K miles and the wear indicators are visible thus it potentially will need replacing at ±75K miles as other Cayenne users have reported (lots of hilly terrain and traffic being the norm, not cruising all day in a straight line like most US highways). In order to get a better idea if in fact I'll need to replace them at the ±75K mile mark, I decided to learn about the subject matter and decided to share with others as reference material. The information I provided will help others try and get a better idea of where they stand with regards to the wear on used CCBs.
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Now: 2013 Cayenne GTS
Ex: 1999 C2, 2004 Cayenne Turbo, 2002 C4S, 1999 BMW M Z3 Coupe, 2013 Audi RS5
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