Trooper LTD 4WD V6-3.5L (2002)
1) Inspect the check valve (2), which is installed inside the vacuum hose.
2) Air should pass freely from the vacuum booster (3) to the engine (1).
3) Air should not pass from the engine (1) to the vacuum booster (3). If it does, the check valve is inoperative and must be replaced.
Installation
1) Install vacuum booster and vacuum booster push rod adjustment.
Note: When replacing either the master cylinder or vacuum booster, be sure to measure push rod, and adjust if required.
2) Remove retainer from vacuum booster front shell using a small screwdriver. Then gently draw plate and seal assembly out of the shell inside.
3) Set push rod gauge J-39216 on vacuum booster, and apply negative pressure by means of vacuum pump J-23738- A so that the pressure in the
vacuum booster becomes 500 mm Hg.
Note: Be sure to apply NEGATIVE pressure after installing a push rod gauge on the vacuum booster.