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Master Cylinder Push Rod

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NOTE: Use the following procedure to measure how far the booster piston rod protrudes from booster when vacuum is applied to booster. Piston rod is not adjustable. If piston rod protrusion is out of limits, rod must replaced with an adjustable service rod.
  1. Booster does not have to be installed to perform procedure. Apply 25 in. Hg vacuum or the MAXIMUM available engine vacuum to booster. Position Piston Rod Gauge (J-37839) over piston rod. See Fig 1 . One side of gauge measures minimum rod length. The other side measures maximum rod length.
  2. If piston rod length does not fall between maximum and minimum dimensions, disassemble booster. See OVERHAUL. Replace piston rod with an adjustable service piston rod (with self-locking screw) to make adjustment.
Fig 1: Gauging Piston Push Rod
G50J00454Courtesy of GENERAL MOTORS CORP.
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