2. Remove the one-way valve and vacuum hose from the booster unit.
3. From inside the vehicle, disconnect the return spring from the brake pedal and the booster pushrod clamp. Remove the bracket and remove the pin.
4. Remove the mounting nuts securing the booster unit to the pedal hanger and bulkhead.
5. Remove the block into the engine compartment. Remove the rubber O-ring from the block and replace if necessary.
6. Before installing the block, check the size of the push rod, referring to Fig. 9.29. If necessary, loosen the lock nut, reinstall the clamp, then retighten the lock nut.
7. Installation is carried out in the reverse order. Lubricate the pin with a universal lubricant. Finally, insert the rubber O-ring into the partition to seal the hole.