This is a complete bolt-in kit designed to work on a 1969 International Loadstar 1600 that gives you a modern firewall-mounted Kodiak / Topkick style hydroboost booster and huge 2" bore master cylinder. It likely works on other years and models, too. This does away with the slave system and under under-mounted booster. This kit installs in about an hour and requires no cutting or permanent modification. It works with your existing brake pedal.
This is meant to work with applications having a factory firewall mounted master cylinder held on by 3 bolts with a 2.75" by 2.75" by 2.75" pattern from center to center.
 
For the brake line routing, you need to separate out two circuits to get the safety benefit of a dual circuit master. You can reuse all of the existing lines that are downstream of the original junction block.
 
Tag Axle
Trucks that have a second (tag) axle have a secondary brake booster and master cylinder that feeds the rear axle. Our firewall-mounted system does not replace this secondary system. We have limited experience with this. Please review that system before purchasing, but it can likely remain intact and operational with the modern brake booster serving the primary axle. Using the new master cylinder to serve two rear axles will cause an out-of-proportion system, and the front brakes will do all the work, with the rear brakes being hardly activated
 
Included parts with this kit:
Firewall booster brackets, painted black
Kodiak style hydroboost
Kodiak style 2" bore dual output master cylinder
12 volt backup pump and relay
High pressure hose and low pressure return line for hydroboost
6AN adapter fittings for high pressure plumbing
Custom bushing designed to mate SD booster eyelet to factory brake pedal
High quality grade 8 hardware for entire install
Flare adapter fittings- to connect standard 7/16" inverted flare fittings to the master cylinder (common on 1/4" lines)
 
These brackets are designed, laser cut, and formed right here in the USA. The parts supplied with them are top quality