Ready for the trash heap. Our installation was tougher because we were converting from an ABS system to a non-ABS system. If you're replacing your factory single-diaphragm booster with Dave's dual-diaphragm booster it will be a simpler process. Another thing hindering braking performace: the rear drums were far out of adjustment. Between the Dave's Customs Unlimited brake booster and the adjusted rear drums this XJ now stops with authority, the way it should have a long time ago.