This is step by step according to my book
let me know if you need more info
Disconnect negative battery cable.
Remove air cleaner (if necessary).
Disconnect manifold vacuum hose from booster check valve.
Depress brake pedal several times to release vacuum in system (if ABS equipped).
Disconnect brakelines from master cylinder.
Remove master cylinder-to-brake booster nuts. Remove master cylinder.
From under dash, remove brakelight switch wiring connector.
Remove brakelight retaining pin. Slide brakelight switch off brake pedal pin just enough for outer plate of brakelight switch to clear pin. Remove brakelight switch from pin. DO NOT damage switch during removal.
Remove booster-to-dash panel retaining nuts. Slide booster push rod, bushing and inner nylon washer off brake pedal pin. From under hood, move booster forward until booster studs clear firewall.
Rotate front of booster inward (toward engine), and remove booster by raising until clear.
To install, reverse removal procedure