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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 >> Adjustments >> Master Cylinder Push Rod

Master Cylinder Push Rod

NOTE: On some models, production push rod is not adjustable. If production rod is reused, gauging is to check proper assembly. If adjustable service push rod is used to replace production rod, use procedure to set to correct rod length.
  1. Place power unit in a vise with front housing up. Remove front seal to ensure all vacuum is released from unit. Place master cylinder rod, flat end first, in piston rod retainer. Press down on rod with 50 lbs. (23 kg) pressure to make sure rod is seated.
    Fig 1: Checking Push Rod Height Chevrolet and GMC are checked with gauge (J-22647).
    G31011
  2. Place gauge (J-22647) over piston rod so it can be moved from left to right without contacting studs. The center section of gauge has 2 levels.
  3. The piston rod should always contact the lower level and never contact the highest level. If the push rod does not contact gauge correctly, an adjustable push rod must be obtained.
  4. Adjust locking screw on rod to obtain correct clearance with gauge. Apply silicone lubricant on the inside diameter of front housing seal and place seal in position in housing depression.
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