Vacuum Power Booster Push Rod
- Push rod has an adjustment screw to maintain correct distance between booster push rod and master cylinder piston. If push rod is adjusted too long, it prevents master cylinder piston from completely releasing hydraulic pressure, causing brakes to drag. If push rod is adjusted too short, it causes excessive pedal travel and an undesirable groaning noise in booster area.
- Remove master cylinder to access push rod. To check screw adjustment, fabricate a gauge. See Fig 1
. With engine running, place gauge against master cylinder mounting surface of booster. Adjust push rod screw by turning it until end of screw just touches inner edge of gauge slot.
Courtesy of FORD MOTOR CO.