Complete the disc brake conversion on your 1963-66 Fits Chevy pickup (or enhance your existing brake system) with this high quality master cylinder and brake booster kit. It includes a 8" power booster, dual-chamber master cylinder and a proportioning valve specifically designed for 1963-66 Fits Chevy trucks. The easy-to-install kit can be set up for disc/drum applications. Learn more about selecting the proper master cylinder for your vehicle by reading our tech article. Brake System Selection.