Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Vacuum Brake Booster: Service and Repair
1.
Disconnect battery ground cable.
2.
Disconnect stop lamp switch electrical connectors.
3.
Support underside of master cylinder, then remove power brake unit-to-master cylinder attaching nuts.
4.
Remove vacuum hose between manifold and power brake unit, or power brake unit check valve. Remove check valve, if equipped.
5.
Separate power brake unit and master cylinder, leaving master cylinder supported far enough away to allow removal of power brake unit.
6.
On models equipped with push rod mounted stop lamp switch, remove retaining pin, then slide switch, push rod, spacers and bushing off brake
pedal pin.
7.
On models equipped with brake pedal mounted stop lamp switch, remove attaching bolt, nut and plastic bushing, then disconnect power brake unit
push rod from brake pedal.
8.
Remove power brake unit attaching bolts and the power brake unit.
9.
Reverse procedure to install.
