FYI, for those who are newer to the community, here was GM's explanation for the original brake weights:
Some early Camaro customers noticed that there are weights on the Camaro SS calipers. With high-performance vehicles like the Camaro SS, minor brake noise is not uncommon. The weights act as a damper to reduce noise in certain driving conditions. This was done after careful evaluation and validation by our engineering team. These weights will only be added to early builds of the Camaro SS.