General Motors has issued a recall for certain large trucks and SUVs due to a missing component that could cause wheel lockup. The recall affects various Chevrolet, GMC, and Cadillac models, with some outlets reporting that owners are being warned not to drive their vehicles until the issue is addressed. The specific models and number of vehicles affected appear to be somewhat unclear, with reports ranging from 66 models to 22 different vehicles being subject to the "do not drive" warning.