Two problems related to brake loud noise have been reported for the 2003 GMC Sierra. The most recently reported issues are listed below.
On 11/11/2014, truck suddenly veered to left, crossed middle of road and went halfway into ditch, road did have a small amount of snow[1/2 inch], this happened just as I topped a small hill. On 11/16/2014 again as I topped a hill on a curve the truck suddenly veered to the left, crossed the middle of the road and did go completely in the ditch. On 11/30/2014 as I backed out of the garage, the brake pedal went to the floor and had a horrible noise when I applied the brake. I made an appointment with my mechanic and he found the brake caliper was froze up and sheared off the brakepad and this ruined the brake rotor, this of course caused the loss of brakes on the right rear side, which must have been pulling me off the road. Luckily we suffered no serious injuries and no other vehicles were on the road.
Brake failure at low speed stop, brake pedal became soft, went to floor, loud noise in front end, vehicle pulled to the right. Did not stop until pedal was pumped again. Works normaly now.