The contact owns a 2007 Chevrolet Cobalt. While driving 55 mph, the brakes pulsated when the brake pedal was depressed. The vehicle was taken to a repair shop and the mechanic stated that the rotors were faulty and needed to be turned. The rotors had been turned twice within 32,000 miles. The dealer stated that it was their policy to only turn the rotors. The vehicle has been repaired. The failure mileage was 16,000 and current mileage was 63,000.

- San Louis, MO, USA

2007 Chevy Cobalt ss, front brake rotors obtain dangerous runout conditions. In my case the original set lasted 8000 miles, and the replacement obtained from dealer in July 2007 lasted 20000 miles. Symptoms of this runout include heavy shutter of brake pedal and steering wheel at freeway speeds down to about 30mph and noticeable thumping in steering wheel at freeway speeds when not applying brakes. Runout on rotors is so severe that it actually causes a ride disturbance without applying brakes. Have address this issue with Sierra Chevrolet in monrovia to no avail. Was simply told that I would have to purchase new rotors. No remedy appears to be available to correct this problem. Apparently, there is a poor design of rotors or some type of issue with the brake pads being too aggressive. Suspect rotors obtain heavy grooving within a few thousand miles. After grooving is noticed, the vibrations begin very subtle soon after and progress to the point to where the vibrations are noticeable even when not applying brakes. I am on my third set of rotors, and am fearful that General Motors will never pay any attention to this potentially dangerous issue. I believe that perhaps a less aggressive brake pad needs to be used or some kind of problem exists with how the rotors seats to the hub. I am only familiar with this problem on the ss models, I also have a 2005 Cobalt base model that has no issues with the brakes what so ever. Many complaints noticed on the web forums for ss Cobalts. These people have complained to their local dealers to no avail also. I have run out of options, other than to keep an extra set of pads and rotors available at all times at the cost of 450 dollars per set. Dealer refuses to consider premature rotor wear as a warranty issue or any issue for that matter, forcing me to buy the parts and pay the labor for a problem that I have no control of.

- Duarte, CA, USA