I just realized that at the rear rotors we all have 2 Torx screws per side, one larger than the other. In my case the small one on the right is corroded and almost destroyed and the other on the left is missing. I called the dealership today to ask for replacement but unfortunately they don't have in stock. (Capital Controls in Greece hace restricted imports).

If anyone can help I would like to know the exact size of the small screw in order to search at stores for a replacement. Is it something common that I can find in stores?

 

http://www.ecstuning.com/News/Porsch...011_2012_2013/

 

I just did the replacement. The smaller one is a cap that covers the e-brake adjustment. The larger holds the rotor to the spindle. The larger is on tight. I did not find the smaller to be to tight. Also in a pinch you do not actually have to remove it.

 

Thanks a lot guys! I ended up buying 4 screws from Porsche for €14.