The ABS will not apply the brakes if your foot is off of the brake, but the stability system could have done that. It is unusual that it happened this way, but apparently the sensor read that one wheel started going much faster, so the stability system applied the brake on that wheel, but the signal didn't change so it tried to apply that brake even harder. I'm sure Hummer will be all over this to try to keep this problem from happening to other trucks.
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