This Brake Master cylinder has a larger 3" high capacity fluid bowl, making it ideal for vehicles with single line brakes. It is designed to fit all Cooper S and 1275GT models, as well as standard single line Mini models in need of a larger fluid reservoir for use with calipers. With a 0.70" bore size, this master cylinder is a reliable and efficient replacement for your Mini Cooper braking system. This product is a durable and high-quality option for those in need of a reliable brake master cylinder, with its metal construction ensuring long-lasting performance. Upgrade your Mini Cooper's braking system with this disk type metal brake master cylinder for improved safety and reliability on the road.