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 power brake booster. Power brake booster is now serviced as a complete assembly and is no longer rebuildable.
Booster does not have to be installed to perform procedure. Apply 20-25 in. Hg vacuum or 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, replace piston rod with service-adjustable piston rod to obtain correct dimension.