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ACDelco Professional Brake Master Cylinders use both aluminum and iron castings, making them a high quality replacement for many vehicles on the road today. These master cylinders contain both Ethylene Propylene (EPDM) and Styrene Butadiene (SBR) rubber components to provide superior resistance to heat, corrosion, and leakage. ACDelco Professional Brake Master Cylinders are ready to bench bleed and install right out of the box - no assembly required. These premium aftermarket replacement brake master cylinders are manufactured to meet your expectations for fit, form, and function. Meets the brake performance requirements of SAE J1153 and J1154 testing, providing reliability and quality Pressure tested to ensure safe and confident braking Cast iron and aluminum specifications; no extra stress on the brake boosting mounting Geometrical tolerance ensures that the body and plastic reservoir match for a proper fit Piston assembly and return spring help to prevent brake drag, which can cause premature brake pad wear Meets the brake performance requirements of SAE J1153 and J1154 testing, providing reliability and quality Pressure tested to ensure safe and confident braking Cast iron and aluminum specifications provide no extra stress on the brake boosting mounting Geometrical tolerance ensures that the body and plastic reservoir match for a proper fit Piston assembly and return spring help to prevent brake drag, which can cause premature brake pad wear Brand ACDelco Model Master Cylinder Assembly Exterior Painted Item Weight 5 pounds Manufacturer ACDelco OEM Part Number 18030256 Item model number 18M14 Product Dimensions 9.4 x 5.8 x 4.8 inches Manufacturer Part Number 18030256 Is Discontinued By Manufacturer Yes