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Home >> GMC >> 1980 >> Rally G3500, Van Cargo >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Power Brake Units - DELCO-Moraine Dual Diaphragm >> Adjustment >> Push Rod Adjustment

Push Rod Adjustment

NOTE: This adjustment applies to Chevrolet and GMC only. Jeep push rod is non adjustable.
  1. Insert master cylinder piston rod, flat end first, into piston rod retainer. Ensure rod is properly seated. Remove front housing seal to assure there is no vacuum in unit.
  2. Place suitable gauge (J-22647) over piston rod, in a position which will allow gauge to be moved right or left without contacting studs. Piston rod should contact longer section of gauge. Rod is non-adjustable; if out of limits, replace with proper service rod.
    Fig 1: Exploded View of Power Piston Assembly
    G09317505Courtesy of NOT AVAILABLE