Power Brake Unit: Disassembly
- With unit removed from vehicle, remove piston rod, push rod clevis and nut. Scribe match marks between front and rear housing for reassembly.
- Using Fixture and Handle (J 23456) and Adapter (J 23456 51), compress housing. Rotate front housing and carefully release compression to separate housing halves.
- Remove piston return spring. Remove following parts in order: boot, air cleaner elements, air cleaner separator and power brake piston.
- Remove diaphragm from power brake piston. Gently push air valve assembly into power brake piston and remove stopper key. Remove air valve assembly. Air valve assembly is serviced as a unit and cannot be disassembled.
- Using fingers only, pick reaction disc out of power brake piston. Using Fixture (J 24435 4) and Mandril (J 34874), lightly hammer oil seal out of rear housing.