SEVERAL BRAKE LINES HAVE RUSTED THROUGH, THIS CAUSED LOSS OF BRAKE FLUID AND LOSS OF ANY BRAKING. THIS HAS CAUSED ME TO BE WITHOUT A TRUCK. DO TO THIS DEFECT GMC HAS CAUSED A VERY DANGEROUS VEHICLE TO BE ON THE ROAD. THIS WILL NOW COST ME TWO THOUSAND DOLLARS TO MAKE MY TRUCK SAFE TO DRIVE. GMC NEEDS TO BE HELD RESPONSIBLE FOR THIS POOR MATERIAL IN BRAKE LINE MATERIAL. PLEASE CORRECT THIS DEFECT BEFORE LIVES ARE LOST.