The brake rotors on my 2008 GMC Sierra with 16, 000 original miles still under GMC bumper to bumper warranty warped. I took it to Newby GMC in St.George Utah first told me it was not covered because I was past 7, 000 miles. I said what? Show me where it says that. The service writer then said it had to be under 12, 000 miles. I said I have a 3 years 36, 000 bumper to bumper warranty. After one hour I was told the mechanic found no problems when he drove the truck. I asked him to check it again.. Well this time he said the rotors may be warped... read full review »