Power Brake Booster Piston Rod
NOTE:
Use the following procedure to measure how far 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, replace rod with an adjustable service rod.
- 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. Other side measures maximum rod length.
- 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 adjustments.