OER Parts offers a wide selection of Brake Components for your 1980 GMC All Models. OER Parts offers 1980 GMC All Models Brake Lines & Hoses, 1980 GMC All Models Brackets, 1980 GMC All Models Brake Valves, 1980 GMC All Models Clips, 1980 GMC All Models Distribution Block, 1980 GMC All Models Fittings and Tees, 1980 GMC All Models Rubber Hoses, 1980 GMC All Models Shields, and 1980 GMC All Models Steel Lines.