In addition to making the Jeep run, we also needed a way to make it stop. The Wrangler comes with a standard brake booster powered by engine vacuum. However the diesel Mega Cab is outfitted with a hydro-boost system where the brakes are powered off of the power-steering pump since diesel engines do not offer the vacuum required for proper braking. We looked into aftermarket vacuum pumps, but decided instead to graft the Dodge hydroboost onto the Jeep firewall, as well as integrate the factory antilock brakes. The resulting brake system with the Dodge Power Wagon discs at all four corners was excellent, even with big tires.