Our 1953-56 Ford F100 truck Wilwood power brake booster kits mount on the firewall. These kits greatly increase your stopping performance while making it easier on the driver. This kit come with a Black Outadjustable prop valve taking all the quess work out of the installation. Also makes going to rear disc brakes a snap with out haveing to replace the existing disc/drum prop valve found on most other kits. These components are a must when upgrading to disc brakes and come completely assembled, ready to install.