Upgrade your manual brake car to a 8 in. Dual Diaphragm power booster and a 1 in. dual bowl master cylinder with our quick install kit. Additionally, with this hydraulic brake booster kit we include an adjustable valve which will be installed to your rear brake line with the hardware supplied. This adjustable valve allows you to fine tune the amount of pressure your rear brakes receive in order to prevent rear wheel lockup. With this kit you will also receive a factory style power brake pedal that installs easily into the factory pedal support with no modifications. A great kit with a factory look and easy installation!