Following the course of pressurized fluid, we delve into the hydroboost before proceeding to the guts of the steering box. For the teardown and rebuild of the hydroboost brake booster, we headed to Vanco Power Brake Supply. Vanco has been building powerful hydroboost systems since the early '90s, when they realized that the hydraulic booster system resulted in two to three times more pressure to the brakes than a normal vacuum booster-a great upgrade for trucks with massive tires to slow down. The Vanco team quickly had our hydroboost disassembled into what looks like a jumbled mess of springs, rods, and pistons. The parts to the far left are what's inside a normal master cylinder, while the parts to the right make up the hydroboost system.