Except XL-7

Length of brake booster piston rod is adjusted to provide zero clearance between brake booster piston rod and master cylinder piston. Remove vacuum brake booster from vehicle. See POWER BRAKE BOOSTER  under REMOVAL & INSTALLATION. Push piston rod several times to ensure reaction disc is in place. Remove piston rod seal from booster (if equipped). Set Booster Piston Rod Gauge (09950-96010) on master cylinder, until it contacts piston. Turn gauge upside down and place it on booster. No clearance should exist. Adjust by turning adjusting bolt of booster piston rod using Special Tool (09952-16010).