Master Cylinder: Installation

Check and adjust clearance between power assist servo push rod and master cylinder piston if either unit is replaced or overhauled. See Fig 1. Clearance between push rod of power assist servo and pin head of depth gauge must be zero.
If not, adjust male portion of push rod with open end wrench while holding female portion of rod with pliers to obtain operating clearance of .004-.020" (.1-.5 mm) with idle vacuum applied to servo. To install, reverse removal procedures and bleed brake system.

Fig 1: Measuring Clearance Between Master Cylinder & Power Assist Servo