Removal Procedure

Turn the engine OFF.
Apply and release the brake pedal several times until the brake pedal becomes firm to deplete the power brake booster vacuum reserve.
Remove and properly dispose of the brake fluid in the master cylinder reservoir.
Disconnect the electrical connector.
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Power Brake Booster Vacuum Sensor (1) - Remove
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Brake Master Cylinder (1) - Remove - Brake Master Cylinder Replacement (Holden)
Camshaft Cover-Right Side - Remove - Camshaft Cover Replacement - Right Side
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NOTE:
Do NOT loosen the power brake booster bolts completely.

Power Brake Booster Bolt (1) - Loosen [2x]
Brake Pedal Position Sensor - Remove - Brake Pedal Position Sensor Replacement
With the aid of an assistant, hold the power brake booster away from the dash panel.
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Release the brake pedal push rod retainer (1) from the brake pedal push rod (2) by pulling the brake pedal rearward.
Completely loosen the 2 power brake booster bolts.
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Power Brake Booster (1) - Remove
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Power Brake Booster Seal (1) - Inspect for damage
Replace the power brake booster seal if damaged.
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NOTE:
Insert a long, thin tool through the power brake booster pass-through from the engine compartment to remove the brake pedal retainer.

Brake Pedal Retainer (1) - Remove and DISCARD