[Gus Berges]

This is a left hand drive Cayenne (just like in USA). No clue as to why it has wore off more on one side than the other at the front, but not at the rear. When I've replaced discs, I always have done both sides of the axle at once and in more than a couple of times, I've replaced all 4 corners even if a pair did not need it right away.

More rear tire wear is normal as these are heavily rear traction biased (62% rear, 38% front is what has been stated many times), so no issues there, but by the same design, the rear brake pads also (normally) wear out quicker as it's what Cayennes use to control tire spin/partial traction control. In this specific case, the rear discs show almost half as much wear as the fronts, something that they also don't have an explanation for (thus me having doubts about their measurements overall...).

There is a local owner that has a 958 Cayenne Turbo with iron rotors and he goes through rear pads every four months or so and new rear discs once a year. He also goes through rear tires twice as fast as the fronts. You'd think he drives a 930 instead!