OER Parts offers a wide selection of Brake Components for your 1980 GMC All Models. OER Parts offers 1980 GMC All Models Brake Hardware, 1980 GMC All Models Disc Brake Hardware, 1980 GMC All Models Drum Brake Hardware, 1980 GMC All Models Backing Plates, 1980 GMC All Models Caliper Brackets, 1980 GMC All Models Disc Brake Caliper Piston, 1980 GMC All Models Brake Spring Set and 1980 GMC All Models Caliper Mount Bolts.