A double-diaphragm brake booster from Dave's Customs Unlimited is the solution to our ABS problem. While it would have been possible to repair the factory ABS system, that system worked poorly even in 1991 when it was brand new. Furthermore, ABS systems typically don't work well in the dirt, reducing stopping power and increasing stopping distance at exactly the wrong time. Dave Seger of Dave's Customs Unlimited chose our master cylinder based on the stock axles and brakes. If we'd had custom axles and monster-sized calipers he would've picked a master cylinder to match those, too.