This is a serious problem. I have heard other Chev trucks have similar problem. When braking softly/normally the brake grabs but feels like it is letting go. Sort of a rough vibrating feel. Then the abs and stability lights come on. I have had the brakes changed with new GM, modules changed, the codes read, the wheel sensors changed. Nothing seems to help. I can just back out of the driveway and the abs/stability lights go on. Very frustrating. Dealers have been no help.