My 2021 Traverse brakes make a growling noise during normal stops especially when cold. Brakes work fine but makes an unsettling noise. Chevy dealer examined and ruled out any foreign material (rocks) interfering in rotors. Dealer determined GM has issued Document ID 5774764 acknowledging this condition and believe it is the composition of the brake pad material. This includes numerous GM makes and models. GM says safe to drive until engineering defines a solution.