GPS Automotive FC0002HK - Hydraulic Kit - Power Brakes 7" Zinc Booster Cast Iron Master Cylinder Adjustable Proportioning Valve Auto Trans Upgrade your car to a 1" dual bore master cylinder with our quick install kit. This kit allows you to upgrade your factory single bowl manual brake car to dual bowl manual brakes in no time In this kit you receive the brake lines necessary to route from the new master cylinder to your factory 3 port distribution block This adjustable valve allows you to fine tune the amount of pressure your rear brakes receive in order to prevent rear wheel lockup A great kit with a factory look and easy installation!