Power Brake Unit: Disassembly
- Scribe an index mark across front and rear power brake unit housings for reassembly reference. On Civic models, remove lock spring and lock plate.
- Drain brake fluid. Remove master cylinder and output rod.
- To remove and disassemble rear housing on Civic, reinstall master cylinder mount nuts with lock nuts behind them. Tighten nuts against each other on studs.
- Clamp power brake unit in vise. Tighten vise against locked nuts on studs. Attach brake unit handles (07967-6340000) to rear housing with 4 nuts. Turn rear housing counterclockwise until locking tabs are free of slots on front housing. See Fig 1 .
- Remove reaction cover, reaction ring and reaction plates. Pry bushing retainer out of rear housing. Remove bushing and piston seal. Remove snap ring from push rod.
- Remove valve holder assembly from piston. Remove circlip from valve holder assembly and disassemble valves.
- Pry off diaphragm retainer. Remove diaphragm from piston. Remove rod seal from front housing.
- To remove and disassemble rear housing on Accord & Prelude, carefully remove retaining circlips while holding front and rear housing together. Remove washers and seals from rear housing. Remove snap ring.
- Remove spring retainer, booster spring, retainer and through bolt boots. Remove output rod, reaction disc and pushrod seat.
- Remove diaphragm from rear housing. Remove yoke, push rod lock nut, star lock nut, adjuster and filter.
- Remove snap ring and valve holder assembly. Remove circlip from valve holder assembly and disassemble. See Fig 2 .