Wilwood tandem chamber master cylinders represent the latest refinements in brake pressure actuation and fluid control. The features incorporated in this innovative and unique design make them the perfect choice for a wide range of custom manual or power brake applications. High-pressure die casting of a premium alloy produces a high-capacity body that is lightweight, looks great, and has the durability for competition. A black anodized, machined billet lid captures a pressure-balanced bellows gasket with 100 percent sealing against moisture invasion or fluid leakage.