The rear brake pads on 992 wear out very fast because of the PTV+ (the Porsche Torque Vectoring system). You can NOT turn off the PTV, unlike the PSM. Even when You have turned off the PSM completely, the PTV will still work. What PTV does is it applies each of the four brakes selectively (sometimes even when You are NOT braking), attempting to correct a perceived instability. So, for example, during hard cornering, the PTV will react to perceived "loss of stability"and will apply the INSIDE REAR brake. In tricky road situations, the result is that the car's rear end gets "tucked in" while cornering and an unwanted slide can be prevented. In track situations, or when You WANT the rear to slide out, the PTV will still attempt to stabilize the car and will apply the rear brake, regardless if You want it or not. I have had the rear brake pads totally worn out after just about 3 or 4 track days, while fronts still quite good. The rear brake wear will be especially heavy if You happen to just do some drift training on wet or on snow. The PTV does not "know" and does not care if You want the car sideways just for fun. On the public road, the system can sometimes save a foolish driver from a crash. On a track or skidpad, it works just as well - You just need to keep a stock of extra rear brake pads....
