Vacuum Brake Booster: Description and Operation

DESCRIPTION
The diaphragm-type power brake booster:
^ is self-contained.
^ is mounted on the engine side of the dash panel.
^ uses engine intake manifold vacuum and atmospheric pressure for its power.
^ must be replaced with a new power brake booster if it becomes damaged or inoperative.
^ utilizes a power brake booster check valve (2365) to provide temporary power assist when the vacuum source is reduced.

SERVICING
^ Adjustment of the push rod (non-ABS only) and replacement of the check valve are the only services permitted on the power brake booster.
^ The power brake booster is serviced only as an assembly.
^ The power brake booster check valve, hose and grommet are serviced separately.

PUSH-ROD
The power brake booster has an adjustable push rod (output rod) which is used to compensate for dimensional variations in an assembled power brake booster. The push rod length is adjusted after it has been assembled in production. A properly adjusted push rod that remains within the power brake booster after it was assembled in production should never require a service adjustment.