This booster and master cylinder set will bolt to your trucks firewall. Easily converts your trucks brake system to power. Our IMPROVED set comes completely assembled. Set includes: bracket, 8" dual diaphragm booster, dual master cylinder, clutch master cylinder, all mounting hardware, proportioning valve (when applicable) and detailed instructions. Kits are available for Drum/Drum, Disc/Drum, and Disc/Disc applications. Can be used with MANUAL transmissions with hydraulic clutch only. NOTE: Drum brake setup does not use a proportioning valve