Power Brake Units - BENDIX Dual Diaphragm: Overhaul: Disassembly
- Scribe mark across master cylinder flange and power unit halves for reassembly. Remove master cylinder, then remove push rod and seal. Slide seal from rod. Remove vacuum check valve and grommet, if necessary. From rear housing air valve rod, remove dust boot and filter silencer. Extract air filter retainer, air filter, and silencer, using an awl or other suitable tool. Reinstall steel retainer to hub. Pour alcohol down valve operating rod (to aid removal), place end of rod in vise, and pry rod from unit (see illustration).
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- Straighten four longest tabs on rear housing. Attach suitable separator tool (J-23456), apply slight downward pressure and turn front housing counterclockwise, release pressure on housing, then separate housings. Remove diaphragm assembly from rear housing. If necessary, use suitable tool and drive seal from rear housing. Wet rear diaphragm spring retainer with alcohol and remove diaphragm from rear plate (using fingers only).
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- Place 1 1/16" hex stock (2" long) in vise, or other suitable tool (J-22839), set diaphragm and plate assembly on tool, then twist rear plate counterclockwise until plates are loose. Remove assembly from tool and place on bench with front plate down. Lift rear plate from front plate hub. Remove valve plunger and spring. Remove "O" ring. Push out reaction disc. Slide center plate from front plate hub.