Master Cylinder - CJ, CHEROKEE, Scrambler & WAGONEER: 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. On Jeep CJ7 and Scrambler models, remove push rod from primary piston. Remove and discard all rubber parts from piston assemblies.
5. Enlarge holes in tube seats using a 13/64" drill. Place a large flat washer over outlet and thread a 1/4" x 20 x 3/4" screw into seat. Tighten screw until seat is loose. Remove seat, screw and washer.

Fig 1: Removing Tube Seat from Master Cylinder

Courtesy of AMERICAN MOTORS/JEEP CORP.