They have been referred to as 'ghetto weights'. GM's engineers half-ass way at addressing the problem (if there is really one).
Early in Q12010 production, they began to integrate the 'weights' into the brake pads. No more stick-on's. I had the dealer updgrade mine as there is a service bulletin on this.
Search the forum, that is where I read about it, there is also pics to make it clear (before / after).
The stick-on weights will fall off with heat and time.
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