Chrysler 300M 2002 Service Manual page 143

5 - 44 BRAKES - BASE BRAKE SYSTEM
POWER BRAKE BOOSTER (Continued)
then connect a vacuum gauge to the open vacuum
port on the valve.
(4) Start the engine.
(5) When the engine is at warm operating temper-
ature, allow it to idle and check the vacuum at the
gauge.
If the vacuum supply is 12 inches Hg (40.5 kPa) or
more, the power brake booster is defective and must
be replaced. If the vacuum supply is below 12 inches,
continue on with this BASIC TEST.
(6) Shut off the engine.
(7) Connect the vacuum gauge to the vacuum ref-
erence port on the engine intake manifold.
(8) Start the engine and observe the vacuum
gauge.
If the vacuum is still low, check the engine tune
and repair as necessary. If the vacuum is above 12
inches, the hose or check to the booster has a restric-
tion or leak.
Once an adequate vacuum supply is obtained,
repeat the BASIC TEST.
VACUUM LEAK TEST
(1) Disconnect the vacuum hose on the side of the
power brake booster vacuum check valve that leads
to the speed control, then connect a vacuum gauge to
the open vacuum port on the valve.
(2) Remove the remaining hose on the vacuum
check valve that is not the vacuum supply hose com-
ing from the intake manifold. Cap off the open port
on the check valve.
(3) Start the engine.
(4) Allow the engine to warm up to normal operat-
ing temperature and engine idle.
(5) Using vacuum line pliers, close off the vacuum
supply hose near the booster and observe the vacuum
gauge.
If the vacuum drop exceeds 1.0 inch Hg (3.3 kPa)
in one minute, repeat the above steps to confirm the
reading. The vacuum loss should be less than 1.0
inch Hg in one minute time span. If the loss is more
than 1.0 inch Hg, replace the power brake booster. If
it is not, continue on with this test.
(6) Remove the pliers from the hose temporarily.
(7) Apply light effort (approximately 15 lbs. of
force) to the brake pedal and hold the pedal steady.
Do not move the pedal once the pressure is applied
or the test results may vary.
(8) Have an assistant reattach the pliers to the
vacuum supply hose.
(9) Allow 5 seconds for stabilization, then observe
the vacuum gauge.
If the vacuum drop exceeds 3.0 inches Hg (10 kPa)
in 15 seconds, repeat the above steps to confirm the
reading. The vacuum loss should be less than 3.0
inches Hg in 15 seconds time span. If the loss is
more than 3.0 inches Hg, replace the power brake
booster. If it is not, the booster is not defective.
REMOVAL - POWER BRAKE BOOSTER
(1) Remove the battery ground cable from the
ground stud on the right strut tower. Then, correctly
isolate the ground cable by installing the cable isola-
tor on the ground stud (Fig. 78).
Fig. 78 Correctly Isolated Remote Ground Cable
1 - CABLE ISOLATOR
2 - GROUND STUD
3 - GROUND CABLE
(2) Remove caps from both wiper arms at the
attachment to the pivots to expose the wiper arm
attaching nut. Remove the nut attaching each wiper
arm to its pivot (Fig. 79).
Fig. 79 Wiper Arm Attachment To Pivot
1 - WIPER ARMS
2 - ATTACHING NUT
3 - ATTACHING NUT
(3) Remove the wiper arms from the pivots. Wiper
arms are removed from the pivots by rocking them
back and force on the pivots until they can be pulled
off the pivots.
(4) Remove the wiper module cover and cowl cover
(Fig. 80) from the vehicle.
LH