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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 475/M40 >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Overhaul >> Brake Booster - BENDIX Single Diaphragm >> Disassembly

Brake Booster - BENDIX Single Diaphragm: Disassembly

  1. Scribe mark on housings for reassembly. Remove front housing seal and piston rod. Attach assembly to holding fixture (J-22805). Align tool so that check valve in front housing is not damaged.
  2. Loosen lock nut and remove push rod clevis and lock nut (if equipped). Remove dust boot retainer, dust boot and silencer from diaphragm plate extension.
  3. Partially straighten 4 deepest tabs on rear housing. Place spanner wrench (J-9504) over studs on rear housing and attach with nuts and washers. Press down on wrench and rotate rear housing clockwise to separate. Remove wrench.
    CAUTION: Housings are under spring pressure.
  4. Remove air filter from diaphragm plate extension. Remove diaphragm from groove in diaphragm plate. Handle diaphragm carefully.
  5. Hold diaphragm plate so that push rod is in horizontal position. Depress rod slightly and rotate piston until air valve lock falls from diaphragm plate hub. Remove reaction disc from diaphragm plate bore, using push rod to push disc from seat.
    CAUTION: Remove rear seal only if a new one is available. Do not reuse old seal.
  6. Remove rear shell bearing seal with punch. Remove vacuum check valve and grommet.
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