Two problems related to front suspension hub have been reported for the 2002 GMC Sierra. The most recently reported issues are listed below.
On 01 Nov, I was pulling into a parking spot when my brakes totally failed causing me to crash into a parked car. I was entering the parking spot below 5 mph when the brakes failed. I dropped my truck off at a repair center on 03 Nov and they informed me that both the left front hub bearing was shot and the anti-lock brakes sensor was shot. Both items were replaced.
The contact states the abs system is bad. It almost caused an accident on 8-20-05 because brakes went to the floor. There was no braking power. Had to shift the car into park to get the vehicle to stop. The contact was going very slowly when this happened. This was the first incident of this kind. The dealer repaired the vehicle. They replaced the wheel bearings, the hub, the rotors, and a cable that was attached to the wheel bearing on 8-22-05. It seems to be fixed as of now.