Brake Master Cylinder: Adjustments

Brake Booster Gauge:

Checking Booster Push Rod Length:

The vacuum booster has an adjustable push rod. If necessary, the booster push rod length can be checked with a push rod gauge using the following procedure:

1. Without disconnecting brake tubes, disconnect master cylinder and set it away from booster power unit. Master cylinder must be supported to prevent damaging brake tubes.
2. With engine running, check and adjust push rod length. A force of approximately 22 Nm (5 ft lb) applied to the push rod with the gauge will ensure that push rod is seated with power unit.
3. Install master cylinder on power unit. Gradually alternate tightening of the retaining nuts to 18-33 Nm (13-25 ft lb).
4. With engine idling and master cylinder reservoir removed, observe fluid surface in reservoirs when brake pedal is applied rapidly. Some fluid movement should occur in forward reservoir. If fluid surface movement did not occur, push rod is adjusted too long and procedure must be repeated to prevent eventual brake drag.