Black Wilwood Master Cylinder / Hydroboost Kit. Hydroboost brakes are a great upgrade over manual or vacuum power brakes. These hydraulic assist brakes work off of your power steering pump and are more powerful and compact than a vacuum assist system. Hydroboost brakes work perfect with blown engines and engines with low vacuum. Kit includes the hydroboost, black anodized Wilwood master cylinder and firewall mount brackets. We offer hydroboost hose kits in our store.