Master Cylinder - BENDIX/DELCO-Moraine Dual Piston: Disassembly

1. Clean outside of cylinder thoroughly and remove cover. Drain fluid, and turn cylinder over, pump piston to remove any remaining fluid.
2. On manual brake models, remove boot from cylinder to uncover push rod retainer. Pry up retainer tab to release retainer.
3. On all models, push piston down into cylinder bore. Remove secondary piston stop bolt from front fluid reservoir (if equipped). Remove snap ring from groove in cylinder bore.
4. Remove both piston assemblies. Remove any internal parts remaining in bore.
5. Enlarge holes in tube seats using a 13/16" drill. Place a large flat washer over outlets and thread a 1/4" x 20 x 3/4" screw into seat.
6. Remove seat, screw and washer. Thread a 6 x 32 x 5/8" self tapping screw into tube seat, and push upward with 2 screw-drivers to remove seat.

Fig 1: Removing Tube Seat from Master Cylinder