Formulated with a smooth bore finish, these cylinders have a quality seal to help increase the life of rubber components. Cast iron and aluminum specifications; no extra stress on the brake boosting mounting These premium aftermarket replacement drum brake wheel cylinders are manufactured to meet your expectations for fit, form, and function. ACDelco Professional Drum Brake Wheel Cylinders are ready to bench bleed and install right out of the box - no assembly required. Buy Professional Rear Driver Side Drum Brake Wheel Cylinder for Honda Civic 2003-2005 AcDelco 18E1399 at These wheel cylinders contain both Ethylene Propylene (EPDM) and Styrene Butadiene (SBR) rubber components to provide superior resistance to heat, corrosion, and leakage. Rear Brake Cylinder ACDelco 18E1399 Professional Rear Driver Side Drum Brake Brake Wheel Cylinder Trivalent coated bleeder screws provide extra protection and added durability