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Master Cylinder Push Rod

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NOTE: Factory installed push rod is nonadjustable, and if out of limits, must be replaced with adjustable service rod.
  1. Gauge push rod with booster holding 25 in. Hg (85 kPa) vacuum. The booster can be gauged without being installed on the vehicle by using either suitable vacuum source or the MAXIMUM vacuum available from the engine.
  2. Position Push Rod Height Gauge (J-37839) over piston rod. See Fig 1 . if piston rod length does not fall between the maximum and minimum dimensions, use and adjustable service piston rod (with self-locking screw) to make adjustments.
Fig 1: Gauging Piston Push Rod
G90C00804Courtesy of GENERAL MOTORS CORP.
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