Hydro Boost and Hose Kit
This is the best upgrade that I have done in years! I upgraded the brake system on my 70 2WD K5 years ago with 4 wheel disc brakes, master cylinder, 71-77 proportioning valve, chrome vacuum boost, etc, but there was little improvement in performance from OEM brakes until I installed this hydro boost. I also saved $200 compared to what POL wanted for the same kit.