Brake Disc Caliper problems of the 2008 Chevrolet Cobalt

Left front brake grabs and won't let go, causes pull to left. . Replaced brake hose, and caliper, still does it, believe it will kill my family yet. . It does it for few miles, quits, then repeats at any given time. .

Rear brake pads worn out after 20k mile and rotor are groved and you can hear the brake pads rubbing metal on metal. Also the rear calipers aren't releasing the rear rotors correctly due to caliper slide pins not being lubricated from the factory. Front brake pads and rotor are wearing normally. I dropped my car off at my local Chevrolet dealership for the brakes to be fixed under warranty. I was told if it was a caliper issue then it would be covered underwarranty.

The problem I am experiencing with my 2008 Chevrolet Cobalt ss is the rear brake pads wearing out quickly under normal driving conditions. Because the brake bias is set to the front brakes, they should wear out long before the rear brakes. I believe the problem lies in the hardware of the braking package. Either the caliper is causing the pad to constantly rub the rotor or some other issue is present. I first noticed that the rotors were scored at about 3,000 miles, was told it was normal. At 20,000 miles the rear pads were down to the metal on the inside pad. Also, its not just a problem with the rear pads, every rotor on the car is scored beyond normal wear. This is a known problem with a lot of the 2008+ ss Cobalts, not with the way they are being driven. General motors is aware of the problem, as many people have complained. When I took my car to the dealer, they too said that it was uneven wear that should not have happened. But, instead of looking into the cause of the problem, they simply replaced the rear pads. This was a temporary "patch" not a fix. In 5,000 miles, they'll start to wear again unevenly. I think general motors needs to evaluate the rotors and pads on these cars. Under no circumstances, is there an excuse for the brakes and rotors to be worn out on these cars at 20,000 miles under daily driving conditions. If the problem only effected a couple of cars, it could be blamed on the driving patterns of the operator. However, this is a common problem for all the owners as passed along through enthusiast car forums.

Rear brake calipers not applying even force on both inner and outer pads, causing premature wear and tear on the pads and rotors, and additional stress on the braking system.

At 8,000 miles the rear brake rotors were deeply groved. The front rotors looked fine, no groves. At 18,000 we had to swap out the pads as the friction surface was completely gone. We discussed the problem with the dealer on both occasions, but they said there was nothing they could do as there was no recall. I also tried to question if the problem was with the rotors or pads or calipers, but they said they could not answer these questions. I'm just looking for some answers and service support.

The rear brakes are toast on my new car. I have around 10,000 miles and will soon have to pay for new rotors and pads. Hopefully I can afford to do this before my calipers go out too. 2008 Cobalt ss - premature ware - never driving hard - daily driver -.

The rear brake calipers fail to release properly, causing the inside brake pad to wear more than twice as fast as the outside pad. Therefore forcing the rear pads to be replaced twice as often as the front brake pads.

Under normal daily driving conditions (majority is commuting), my rear rotors and brakr pads were replaced at 21,259km, quote from service order from my dealership, "rear brakes at squealers, confirmed squeal noise from rear. Found rear brake pads at squealers. Both rotors badlyscored. Machined rotors lr19. 0mm and rr19. 10mm replaced rear brake pads". Then at 42,465km brought vehicle to dealership as I could smell burning brakes from the rear end after only 20 min of daily average driving . Following is a quote from my dealership work order, "cause: seized/binds/sticks. Found rear brakes @ 2mm remaining on rear inboard pad. Checked complete hydraulic sys. Checked for abs codes. Checked for bulletins on rear brakes. Checked e brake no problems found. Removed rear calipers and found calipers sticky. Need to be replaced both rear calipers sticky. Need to replace both rear calipers, rotors and pads. Inner pads 2mm outboard 6mm and rotors undr min. Replaced both rear calipers, rotors and brake pads. Bled brake system". Then my dealership followed with "this will be the last time gm will replace rear brakes". As far as I am concerned if the rear brakes are inadequate fro the application and are being worn out and damaging brake parts every 20,000km or so then a recall needs to be done with replacements of an adequate breaking components.

Scoring of inner rear rotor. Noticed after 1100mi. Due to some part of caliper rubbing on rotor.