Brake Loud Noise Problems of Chevrolet Cobalt

The contact owns a 2005 Chevrolet Cobalt. The contact stated that the vehicle started to shake violently and would hesitate sporadically. The contact mentioned that she attempted to engage the brakes but the pedal abnormally traveled to the floorboard, accompanied by an abnormally loud noise. The vehicle was taken to the dealer however, the technician was unable to diagnose the failure. The manufacturer was not made aware of the failure. The vehicle was not repaired. The failure mileage was 122,000 and the current mileage was 125,458.

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When braking softly, rear brakes make a loud noise and ive started to notice slightly uneven wear on one of the rear brake pads. Also occasionally while moving in reverse with foot brakes applied I can hear a very very loud sound slighly different and way louder then the sound when moving forward.

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I bought a used 2009 Cobalt ss. The car had 3200 miles on it. After bring the car home I found some pitting in the rear rotors. After driving the car to 3800 miles it had gotten beyond the point where the rotors could be turned. I took it in to the dealer and was told this is normal everything is fine. Not being born yesturday I know this is not the case. After fighting with the dealer for over an hour I left mad and with no fix for the problem. I have since replaced the rotors with drilled and slotted rotors, and ceramic pads but now it seem as if the rear calipers are not releasing all the way which is causing the car to make rather loud noises while drive. Once again no help from the dealership as they claim everything is normal and everything will be fine. This needs to be fixed as I know of at least a dozen people in my area with the same problem. I fear that if this is not corrected quickly some one may get hurt, or worse yet killed to to parts failure.