Please fill out the following to ask a question. MAKE/B]: Cadillac MODEL: DTS YEAR: 2009 MILES: 78000 ENGINE: 4.6L DESCRIBE ISSUE....The Rotors on this car are warped again. I had the front rotors turned about 30000 mile ago and now I am experiencing pulsing brakes again when I apply the brake. I checked the run out on the front and rear rotor and found the front passenger and both rear rotors have about .010 run out. The front driver side is good with only .0005 run out. My question is when purchasing new rotors what is the different between some of them on the market? I see some state they are high carbon and have a higher price tag. I don't know if that's the thing to buy or not. Thanks?????