Upgrade your factory power brake car to a 8 in. Dual Diaphragm power booster and a 1 in. dual bowl drum brake master cylinder with our quick install kit. This kit allows you to upgrade your factory power brake car to dual bowl power brakes in no time. In this kit you receive the brake lines necessary to route the provide valve to the factory lines. Additionally we include an adjustable combo valve block with a brake pressure switch to activate your tail lights. This adjustable valve allows you to fine tune the amount of pressure your rear brakes receive in order to prevent rear wheel lockup. Included in this kit is a new 1" bore drum brake master cylinder equipped to work with 4 wheel drum brake applications. A great kit with a great look and easy installation!