Bonneville V6-231 3.8L VIN 3 SFI (1988)
6. Remove power piston group and return spring from front housing.
Fig. 9 Power head assembly exploded view. Delco-Moraine tandem diaphragm booster
7. Remove master cylinder piston rod and reaction retainer from front of piston, then the silencer from the rear of the assembly.
8. Hold piston assembly at edges of divider and strike pedal pushrod against work surface to dislodge diaphragm retainer.
