and back off adjuster quadrant approximately 4 to 5
notches.
Fully apply the brake pedal which will cause the
brake shoes to leave the anchor. Upon application of
the brake pedal, the adjuster quadrant should move.
Thus, a definite rotation of the adjuster quadrant can
be observed if the automatic adjuster is working
properly. If one or more adjusters do not function
properly, the respective drum must be removed for
adjuster mechanism servicing.
BRAKE FLUID CONTAMINATION
Indications of fluid contamination are swollen or
deteriorated rubber parts.
Swollen rubber parts indicate the presence of
petroleum in the brake fluid.
To test for contamination, put a small amount of
drained brake fluid in clear glass jar. If fluid sepa-
rates into layers, there is mineral oil or other fluid
contamination of the brake fluid.
If brake fluid is contaminated, drain and thor-
oughly flush system. Replace master cylinder, propor-
tioning valve, caliper seals, wheel cylinder seals,
Antilock Brakes hydraulic unit and all hydraulic
fluid hoses.
RED BRAKE WARNING LAMP
For diagnosis of specific problems with the red
BRAKE warning lamp system, refer to BRAKE SYS-
TEM DIAGNOSIS CHART GUIDE, and CHARTS
located in the DIAGNOSIS AND TESTING section of
this service manual group.
STOP LAMP SWITCH
The required procedure for testing the stop lamp
switch is covered in GROUP 8H - VEHICLE SPEED
CONTROL SYSTEM in this service manual. The
electrical circuit for stop lamps is covered in GROUP
8W - REAR LIGHTING in this service manual.
SERVICE PROCEDURES
BRAKE FLUID LEVEL CHECKING
Brake fluid level should be checked a minimum of
twice a year.
Master cylinder reservoirs are marked, FULL and
MIN, indicating the allowable brake fluid level range
in the master cylinder brake fluid reservoir (Fig. 31).
CAUTION: Use only MoparT brake fluid or an equiv-
alent from a tightly sealed container. Brake fluid
must conform to DOT 3 specifications. Do not use
petroleum-based fluid because seal damage in the
brake system will result.
Although there is a range, the preferred level is
FULL. If necessary, adjust the brake fluid level,
Fig. 28 Brake Drum Maximum Diameter
Identification
Fig. 29 Accessing The Automatic Adjuster Quadrant
Fig. 30 Automatic Adjuster Quadrant
5 - 18 BRAKES JA
DIAGNOSIS AND TESTING (Continued)
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