I have never had much luck with the self adjusting feature. When I first change the shoes, I adjust the brakes manually for the proper clearance. I have always had to periodically manually adjust the brakes afterwards. Maybe the newer models are better but this has been my experience before.
Spongy brakes sometimes mean they need bleeding. Might give that a try. Good luck.
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2009 Silverado, LTZ 4WD Crew Cab,
White Diamond
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