Chevrolet & GMC
- Place power unit in a vise with front housing up. Remove front seal to ensure all vacuum is released from unit. Place master cylinder rod, flat end first, in piston rod retainer. Press down on rod with 40 to 50 pounds of pressure to make sure rod is seated.
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- Place a suitable measuring gauge (J22647) over piston rod in such a position that it can be moved from left to right without contacting studs. The center section of gauge has two levels. The piston rod should always contact the lower level and never contact the highest level.
- If the push rod does not contact gauge correctly, an adjustable push rod must be obtained. Adjust self locking screw on rod to obtain correct clearance with gauge. Apply silicone lubricant on the inside diameter of front housing seal and place seal in position in housing depression.