1974 PETERBILT CONVENTIONAL - SUSPENSION:MULTIPLE AXLE 1974 PETERBILT CONVENTIONAL - SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS 1974 PETERBILT CONVENTIONAL - SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DRUM:DRUM 1974 PETERBILT CONVENTIONAL - STEERING:LINKAGES