I put the GT500 rear rotors and carbotech pads on my 2011 GT after a brake failure. Now, under 4000 miles later, the pads are almost down to the metal and my rotors are so worn I'm worried I might need to replace them. It was suggested to me that the larger rotors require a different parking brake cable, but I can't find any good information on whether or not that's the case, or if I need to get deeper with my troubleshooting. Any ideas?