warning CHEVROLET DYNASTY 1993 User Guide

The power steering pump drive belt should be in-
spected at the time and distance interval described in
the Lubrication and Maintenance Schedules. Refer to
the General Information section of this group.
POWER STEERING FLUID INSPECTION
WARNING: ENGINE MUST NOT BE RUNNING WHEN
INSPECTING POWER STEERING FLUID LEVEL,
PERSONAL INJURY CAN RESULT.
CAUTION: Do not over fill power steering reservoir
when adding fluid, seal damage and leakage can re-
sult.
TO INSPECT FLUID LEVEL:
(1) Position vehicle on a level surface with engine
at normal running temperature. (2) Turn OFF engine and remove ignition key.
(3) Using a wiping cloth, clean oil and dirt residue
from around power steering reservoir cap. (4) Remove reservoir cap or dipstick and wipe off
fluid. (5) Install cap or dipstick.
(6) Remove cap or dipstick. Holding handle or cap
above tip of dipstick, read fluid level (Fig. 4, 5, or 6).
Add fluid if reading is below cold level mark on dip-
stick.
REAR WHEEL BEARINGS
INSPECTION
The rear wheel bearings should be packed with
new lubricant at the distance interval described in the Lubrication and Maintenance Schedules. Refer to
the General Information section of this group. The
bearings should be inspected for contamination and
wear before they are cleaned. Slight discoloration of
bearing rollers and race cup is normal. If metal
Fig. 3 Ball Joint Lubrication
Fig. 4 Power Steering Reservoir DipstickÐ2.2L or 2.5L Engine
Fig. 5 Power Steering Reservoir DipstickÐ3.0L Engine
Fig. 6 Power Steering Reservoir DipstickÐ3.3L or3.8L Engine
0 - 20 LUBRICATION AND MAINTENANCE Ä

flakes are visible in the used lubricant or the bearing
rollers and race cup is discolored, the bearing and
race cup should be replaced. For proper service pro-
cedures, see Group 5, Brakes. Replace the inner seal
whenever the wheel bearings are serviced.
REAR WHEEL BEARING LUBRICATION
CAUTION: Combining two types of lubricant can
cause bearing failure. Wash used or new bearings
with a suitable solvent and blot dry with a lint free
cloth before packing with new lubricant.
WARNING: DO NOT ALLOW BEARING TO SPIN AT
HIGH RPM WHEN USING COMPRESSED AIR TO
BLOW CLEANING SOLVENT FROM BEARING.
BEARING CAGE CAN EXPLODE, CAUSING PER-
SONAL INJURY.
TO LUBRICATE REAR WHEEL BEARINGS:
(1) Hoist rear wheels off the ground and support ve-
hicle on safety stands. Refer to Hoisting Recommenda-
tions in the General Information section of this group.
(2) Remove rear wheels.
(3) Remove brake caliper on vehicles with rear disc
brakes. For proper procedure, see Group 5, Brakes. (4) Remove rear wheel hub (drum) assembly and
remove inner grease seal (Fig. 7). For proper service
procedure, see Group 5, Brakes. (5) Inspect bearings, refer to Inspection paragraph
of this procedure. Wash used lubricant from bearings
with solvent and blot or blow dry. (6) Using a bearing packing device, lubricate the
bearings with Mopar, Wheel Bearing Grease or
equivalent. (7) With a wiping cloth, clean used lubricant form
wheel hub assembly and axle spindle. (8) Install inner wheel bearing in the hub assem-
bly, small end of bearing toward hub. With a finger,
smooth out grease around the outside of bearing. (9) Using a seal driver, install new inner hub seal.
(10) Install wheel hub (drum) assembly on axle
spindle. (11) Install outer wheel bearing over the spindle
end, small end of bearing toward hub. With a finger,
smooth out grease around the outside of bearing. (12) Install washer and spindle nut. While rotating
hub, tighten spindle nut to 27 to 34 N Im (240 to 300
in. lbs.) torque. Loosen spindle nut one quarter turn.
Hand tighten spindle nut. (13) Install spindle nut lock cover, cotter pin and
grease cap. (14) Install disc brake caliper on vehicles with disc
brakes. CAUTION: Pump brake pedal several times before
driving vehicle to verify brake operation.
(15) Install wheel and lower vehicle.
BRAKES
BRAKE PAD AND LINING INSPECTION
The brake pads and linings should be inspected at dis-
tance intervals described in the Lubrication and Main-
tenance Schedules. Refer to the General Information
section of this group. If brake pads or linings appear ex-
cessively worn, the brakes would require service. For
proper service procedures, refer to Group 5, Brakes.
BRAKE HOSE INSPECTION
WARNING: IF FRONT WHEEL, REAR AXLE, OR AN-
TI-LOCK UNIT BRAKE HOSE OUTER COVER IS
CRACKED, CHAFED, OR BULGED, REPLACE HOSE
IMMEDIATELY. BRAKE FAILURE CAN RESULT.
The front wheel, rear axle and anti-lock unit (if
equipped) brake hoses should be inspected at time
and distance intervals described in the Lubrication
and Maintenance Schedules. Refer to the General In-
formation section of this group. A hose must be re-
placed if it has signs of cracking, chafing, fatigue or
bulging. For proper service procedures, refer to
Group 5, Brakes.
BRAKE LINE INSPECTION
The metal brake lines should be inspected when other
under vehicle service is preformed. If a line is pinched,
kinked, or corroded, it should be repaired. For proper
service procedures, refer to Group 5, Brakes.
Fig. 7 Rear Wheel Bearings
Ä LUBRICATION AND MAINTENANCE 0 - 21

BRAKE RESERVOIR LEVEL INSPECTION
WARNING: DO NOT ALLOW PETROLEUM OR WATER
BASE LIQUIDS TO CONTAMINATE BRAKE FLUID,
SEAL DAMAGE AND BRAKE FAILURE CAN RESULT.
RELIEVE PRESSURE IN ANTI-LOCK BRAKE SYS-
TEM BEFORE ADDING BRAKE FLUID TO RESER-
VOIR. IF NOT, BRAKE FLUID COULD DISCHARGED
FROM THE RESERVOIR POSSIBLY CAUSING PER-
SONAL INJURY.
The brake reservoir level should be inspected when
other under hood service is performed. It is normal
for the reservoir level to drop as disc brake pads
wear. When fluid must be added, use Mopar, Brake
Fluid or equivalent. Use only brake fluid conforming
to DOT 3, Federal, Department of Transportation
specification. To avoid brake fluid contamination, use
fluid from a properly sealed container. On vehicles with anti-lock brakes, depressurize the
system before inspecting fluid level. Turn OFF the
ignition and remove the key. Pump the brake pedal
at least 50 times to relieve the pressure in the sys-
tem.
On all vehicles, if fluid should become low after sev-
eral thousand kilometers (miles), fill the reservoir to
level marks on the side of the reservoir (Fig. 8 or 9).
HEADLAMPS
The headlamps should be inspected for intensity
and aim whenever a problem is suspected. When lug-
gage compartment is heavily loaded, the headlamp
aim should be adjusted to compensate for vehicle
height change. For proper service procedures, refer to
Group 8L, Lamps. DRIVER SUPPLEMENTAL AIRBAG SYSTEM
If the AIRBAG indicator lamp does not light at all,
stays lit or lights momentarily or continuously while
driving, a malfunction may have occurred. Prompt service is required. Refer to Group 8M, Restraint
Systems for proper diagnostic procedures.
BODY LUBRICATION
Body mechanisms and linkages should be inspected,
cleaned and lubricated as required to maintain ease of
operation and to prevent corrosion and wear. Before a component is lubricated, oil, grease and dirt
should be wiped off. If necessary, use solvent to clean
component to be lubricated. After lubrication is com-
plete, wipe off excess grease or oil. During winter season, external lock cylinders should
be lubricated with Mopar, Lock Lubricant or equiva-
lent to ensure proper operation when exposed to water
and ice. To assure proper hood latching component operation,
use engine oil to lubricate the lock, safety catch and
hood hinges when other under hood service is per-
formed. Mopar, Multi-purpose Grease or equivalent
should be applied sparingly to all pivot and slide
contact areas.
USE ENGINE OIL ON:
² Door hingesÐHinge pin and pivot points.
² Hood hingesÐPivot points.
² Luggage compartment lid hingesÐPivot points.
USE MOPAR LUBRIPLATE OR EQUIVALENT ON:
² Door check straps.
² Hood counterbalance springs.
² Luggage compartment lid latches.
² Luggage compartment lid prop rod pivots.
² Ash tray slides.
² Fuel Fill Door latch mechanism.
² Park brake mechanism.
² Front seat tracks.
Fig. 8 Anti-lock Brake Reservoir
Fig. 9 Master Cylinder Brake ReservoirÐExcept
Anti-lock
0 - 22 LUBRICATION AND MAINTENANCE Ä

(a) Severe deterioration of rubber isolator; re-
tainers for cracks and distortion and bond failure of
retainers and rubber isolators. (b) Bearings for binding.
(c) Shock Absorber for flat spots over full stroke
also see, Shock Absorbers, (strut damper).
ASSEMBLE (STRUT DAMPER)
(1) Mount the strut assembly in a vertical position.
(2) Place the compressed spring onto the strut as-
sembly, so the end of the coil is seated in the seat re-
cess in lower spring mount (Fig. 9). (3) Install the dust shield, isolator (if so equipped)
jounce bumper, spacer (as required), and spring seat
onto the top of the strut shaft (Fig. 8). (4) Position top spring seat alignment tab correctly
with respect to bottom bracket (Fig. 9). (5) Install the rebound retainer and shaft nut (Fig.
8). (6) Tighten the strut shaft nut using, Strut Rod
Socket And Holder, Special Tool L-4558. Torque strut
shaft nut to 75 N Im (55 ft. lbs.) plus 1/4 turn (Fig. 10).
WARNING: THIS STEP MUST BE DONE BEFORE
SPRING COMPRESSOR, SPECIAL TOOL C-4838 IS
RELEASED FROM THE COIL SPRING.
(7) Verify coil spring is aligned correctly with respect
to bottom bracket (Fig. 9). (8) Release Spring Compressor Tool C-4838.
SUSPENSION COIL SPRINGS
Springs are rated separately for each side of vehicle
depending on optional equipment and type of service.
During service procedures where both springs are
removed, mark springs (Chalk, Tape, etc.) (Fig. 11) to
ensure installation in original position. If the coils
springs require replacement. Be sure that the
springs needing replacement, are replaced with
springs meeting the correct load rating for the
vehicle and its specific options. During service procedures requiring the re-
moval or installation of a coil spring with Spring
Fig. 7 Loosening Strut Assembly Shaft Nut
Fig. 8 Mount Assembly
Fig. 9 Spring Seat Alignment Notch Position to Bracket
Fig. 10 Tighten Strut Rod Nut with Tool
Ä SUSPENSION AND DRIVESHAFTS 2 - 9

WARNING: WHEN REMOVING THE REAR AXLE
PIVOT BUSHING ON VEHICLES EQUIPPED WITH EI-
THER REAR COIL SPRINGS OR AIR SUSPENSION.
THE REAR AXLE MUST BE SUPPORTED BY THE
AXLE AND TRAILING ARM TO ENSURE ADEQUATE
SUPPORT OF REAR AXLE.
(3) Support the rear axle assembly at both the axle
channel and the trailing arm (Fig. 6). Then remove
lower shock absorber to rear axle mounting bolt (Fig.
6).
(4) Remove hanger bracket to frame rail bolts (Fig.
7).
(5) Lower axle assembly down enough to remove
pivot bolt and hanger bracket (Fig. 7). Right side
trailing arm shown.
PIVOT BUSHING REMOVAL FROM AXLE AS- SEMBLY
Remove bushing with Remover/Installer Spe-
cial Tool C-4212-L (Press) and 3 piece set, Spe- cial Tool 6122 (Receiver Support Bridge, Bushing
Remover/Installer and Bushing Remover). (1) Install receiver (support) bridge into base of
press C-4212-L and bushing Remover/Installer disc
onto screw. (2) Position assembly with receiver bridge support-
ing trailing arm while turning screw to begin bushing
removal. (3) After bushing has begun to move replace bushing
remover/installer (round disc) with bushing remover
(oval shaped disc). Use this assembly to finish pressing
bushing out of trailing arm (Fig. 8).
PIVOT BUSHING INSTALLATION
(1) Align the bushing with the bushing mounting
hole in the trailing arm bracket (Fig. 9). Tap bushing in
slightly to hold position. (2) Assemble bushing installer Tool onto press screw
and support bridge into press base. Position assem-
bly as shown in (Fig. 10) and press bushing into
arm to depth shown in (Fig. 9). (3) Position hanger bracket on pivot bushing, and
install through bolt, loose assemble nut (Fig. 11). Right
side trailing arm shown. (4) Position hanger to frame rail (a suitable drift will
aid in guiding hanger bracket into position). Install
and tighten screws to 75 N Im (55 ft. lbs.) torque (Fig.
12). Install lower shock absorber mounting bolt, but
do not tighten. (5) Position brake hose mounting bracket to trailing
arm, install and tighten retaining screw to 11 N Im (95
in. lbs.) torque (Fig. 13). (6) Attach park brake cable housing to hanger
bracket and cable to connector.
Fig. 8 Tools Installed To Remove Bushing
Fig. 6 Remove Pivot Bushing Hanger Bracket Bolts
Fig. 7 Remove Hanger Bracket
Ä SUSPENSION AND DRIVESHAFTS 2 - 53

PIVOT BUSHING AC AG AJ AP BODY
REMOVE FROM VEHICLE
(1) Raise vehicle (see Hoisting, Group 0). Remove
brake hose mounting bracket screw (Fig. 1). (2) Detach park brake cable at connector and from
hanger bracket (Fig. 1).
WARNING: WHEN REMOVING THE REAR AXLE
PIVOT BUSHING ON VEHICLES EQUIPPED WITH EI-
THER REAR COIL SPRINGS OR AIR SUSPENSION.
THE REAR AXLE MUST BE SUPPORTED BY THE
AXLE AND TRAILING ARM TO ENSURE ADEQUATE
SUPPORT OF REAR AXLE. (3) Support the rear axle assembly at both the axle
channel and the trailing arm with jack stands (Fig.
2). Then remove lower shock absorber to rear axle
mounting bolt (Fig. 2).
(4) Remove hanger bracket to frame rail bolts (Fig.
3). (5) Lower axle assembly down enough to remove
pivot bolt and hanger bracket (Fig. 3). Right side
trailing arm shown.
PIVOT BUSHING REMOVAL FROM AXLE AS- SEMBLY
Remove bushing with Remover/Installer Spe-
cial Tool C-4702-7 Press. And 3 piece set, Special
Tool C-4212 and C-4366-1 (Receiver Support
Bridge, Bushing Remover/Installer and Bushing
Remover). (1) Install receiver (support) cup C-4366-1 into base
of press C-4212 and Bushing Remover Cup C-4702-7
onto screw. (2) Position assembly with receiver bridge support-
ing trailing arm while turning screw to begin bushing
removal. (3) After bushing has begun to move replace bushing
remover/installer (round disc) with bushing remover
(oval shaped disc). Use this assembly to finish pressing
bushing out of trailing arm (Fig. 4).
PIVOT BUSHING INSTALLATION
(1) Align the bushing with the bushing mounting
hole in the trailing arm bracket (Fig. 5). Tap bushing in
slightly to hold it in position on trailing arm. (2) Assemble Bushing Installer Special Tool
C-4702-2 onto press screw and Support Cup Special
Fig. 1 Remove Brake Hose Mounting Bracket Screw and Park Brake Cable
Fig. 2 Remove Pivot Bushing Hanger Bracket Bolts
Fig. 3 Remove Hanger Bracket
Fig. 4 Tools Installed To Remove Bushing
Ä SUSPENSION AND DRIVESHAFTS 2 - 55

(3) Check solenoid to volume canister joint.
² Front strut to solenoid valve connection.
² Rear spring to solenoid valve connection.
(4) Check air line for ruptures, cuts, splits or heat
damage. Use a soap and water solution or a liquid de-
veloped for leak detection.
SYSTEM OPERATION
ENGINE RUN OPERATION
The system will compensate for load
addition/removal when.
² The trunk and all doors are closed.
² The engine speed exceeds 600 R.P.M.
² Throttle angle is less than 65 degrees.
² The brake is not applied.
² You are not cornering above 10 mph.
² There is not a charging system problem with the
vehicle.
ENGINE OFF OPERATION
After passengers/load is removed from the vehicle
the system will correct the vehicle attitude after:
² The trunk and all doors are closed.
² The ignition switch is in the OFF position.
Opening the a door or trunk wakes up the body
computer and the air suspension module. The air
suspension system is now capable of leveling, if
required.
LONG TERM IGNITION OFF OPERATION
The system is capable of one an additional leveling
cycle. After 2 continuous hours of ignition key off and
no door open or trunk open activities. This feature is
implemented to eliminate possible ice freeze-up be-
tween the tire and the inner fender shield.
SYSTEM OPERATION INHIBITORS
The air suspension system is inhibited when:
² The trunk is open.
² A door(s) is/are open.
² The brake pedal is engaged.
² The throttle is at the wide open position.
² The charging system fails.
The maximum compressor pump or exhaust
time is 3 minutes.
SYSTEM FAILURES
Vehicles equipped with air suspension and overhead
console. Will alert the driver of an air suspension
system malfunction. A warning Check Air Suspension
will appear on the overhead console screen.
SAFETY CONCERNS
WARNING: REAR AIR SPRINGS MUST BE DEFLATED
BEFORE BEING REMOVED FROM THE VEHICLE.
WARNING: OPEN TRUNK, OR DOOR(S) OR REMOVE
GROUND STRAP FROM BATTERY BEFORE HOIST-
ING OR JACKING A VEHICLE DURING MECHANICAL
REPAIRS.
WARNING: IF THE VEHICLE NEEDS SERVICE OR
REPAIR OF THE REAR SHOCK ABSORBERS OR
REAR AXLE PIVOT BUSHINGS. THE REAR AIR
SPRINGS MUST HAVE THE AIR PRESSURE RE-
MOVED BEFORE THE VEHICLE CAN BE SERVICED
SAFELY.
SHIPPING MODE
(1) Removing shipping height signal for customer
use.
² Use DRB II tester and 1991 Chassis (Air Suspen-
sion) service cartridge.
² Follow DRB II requirements to cancel shipping
height message in the body computer.
² Connect the Ignition Off Draw (I.O.D.) circuit.
The connection of the IOD circuit will cancel
the Shipping height signal. (2) Return to shipping height.
² Set shipping command in the body computer using
the DRB II and the 1991 Chassis (Air suspension)
service cartridge.
² Disconnect the I.O.D. connector.
DIAGNOSIS
INITIAL DIAGNOSTIC CHECK
(1) Check for blown or missing fuses.
Fig. 9 Compressor Current Draw Test
2 - 78 SUSPENSION AND DRIVESHAFTS Ä

(1) Remove dryer-to-compressor retaining screw
(Fig. 13). (2) Rotate dryer assembly 90É to release retaining
tangs from exhaust solenoid housing and withdraw
unit.
INSTALLATION
Inspect O-Ring for damage and location on dryer
assembly. (1) Insert and index air dryer locking tangs into
exhaust solenoid outlet. (2) Rotate air dryer assembly to lock position and
install air dryer-to-compressor retaining screw (Fig.
13).
SOLENOIDS (STRUTS AND AIR SPRINGS)
Front struts and rear springs are equipped with so-
lenoids that control air pressure and volume within
the assemblies. The solenoids are electrically oper-
ated to allow air input, contain air, or release air
pressure, depending on control module commands.
REMOVAL
WARNING: DO NOT ATTEMPT TO REMOVE OR IN-
STALL SOLENOIDS WHILE AIR SUSPENSION
(FRONT STRUTS AND REAR AIR SPRINGS) ARE
SUPPORTING VEHICLE.
Disconnect negative battery cable. Raise vehicle
and remove wheel and tire assembly then remove so-
lenoid(s) as follows: (1) Separate electrical connection to solenoid.
(2) Disconnect air line, see Air Lines and Fittings.
Solenoids have molded square tangs to fit into
stepped notches of the air spring housing. The
notches provide an air relief position and a retaining
position. The retaining position is locked with a re-
taining clip. (3) Remove retaining clip (Fig. 14). (4) Rotate solenoid to first step in housing and al-
low air pressure to vent (Fig. 15).
(5) Rotate solenoid to release slot and remove (Fig.
16).
Fig. 13 Air Dryer Remove/Install
Fig. 14 Remove Retaining Clips
Fig. 15 Release Air Pressure
Fig. 16 Remove Solenoid (Inspect O Ring)
2 - 86 SUSPENSION AND DRIVESHAFTS Ä

BRAKES
CONTENTS
page page
ANTI-LOCK BRAKE SYSTEMÐBENDIX ANTI-LOCK 10 AC/Y BODY ............. 72
ANTI-LOCK BRAKE SYSTEMÐBENDIX ANTI-LOCK 6 AA,AG,AJ,AP BODY ....... 113
BRAKE DISC (ROTOR) ................... 53
BRAKE SUPPORT ASSEMBLY ............. 25
FRONT DISC BRAKES ................... 31
GENERAL INFORMATION .................. 1
HYDRAULIC SYSTEM CONTROL VALVES . . . 26
KELSEY HAYES DOUBLE PIN FAMILY CALIPER ............................ 35 KELSEY HAYES DOUBLE PIN NON-FAMILY
CALIPER ............................ 38
MASTER CYLINDER ..................... 66
PARKING BRAKES ...................... 57
POWER BRAKES ....................... 68
REAR DISC BRAKES .................... 45
REAR WHEEL DRUM BRAKES ............ 18
SERVICE ADJUSTMENTS .................. 4
WHEEL BEARINGS ...................... 70
WHEEL CYLINDERS ..................... 23
GENERAL INFORMATION
Throughout this group, references may be made to
a particular vehicle by letter or number designation.
A chart showing the break down of these designa-
tions is included in the Introduction Section at the
front of this service manual. Standard brake equipment consists of:
² Double pin floating caliper disc front brakes.
² Rear automatic adjusting drum brakes.
² Differential valve with a brake warning switch.
² Master cylinder.
² Vacuum power booster.
² Double pin floating caliper rear disc brakes are
available on some models. The Bendix Anti-Lock 10 braking system, uses the
standard power brake system caliper assemblies,
braking discs, pedal assembly, brake lines and hoses.
The unique parts of the Bendix Anti-Lock 10 braking
system consists of the following components. Propor-
tioning valves, wheel speed sensors, tone wheels,
electronic control unit, modulator assembly and hy-
draulic assembly. These components replace the con-
ventional master cylinder and power booster. The
components will be described in detail in the Bendix
Anti-Lock 10 brake section in this group of the ser-
vice manual. The Bendix Anti-Lock 6 braking system, uses the
following standard brake system components. Master
cylinder, power booster, caliper assemblies, braking
discs, pedal assembly, brake lines and hoses. The
unique parts of the Bendix Anti-Lock 6 braking sys-
tem consists of the following components. Modulator
assembly, unique proportioning valves, wheel speed
sensors, tone wheels, and electronic control unit.
These components will be described in detail in the
Bendix Anti-Lock 6 brake section in this group of the
service manual. The front disc brake shoes have semi-metallic lin-
ings. The hydraulic brake system (Fig .123and4)is
diagonally split on both the Non-ABS and ABS brak-
ing system. With the left front and right rear brakes
on one hydraulic system and the right front and left
rear on the other. The Non-ABS and ABS brake system may use dif-
ferent types of brake line fittings and tubing flares.
The Non-ABS brake system uses double wall tubing
flares and fittings at all tubing joint locations. Some
ABS brake systems use both ISO style tubing flares
and double wall tubing flares and corresponding fit-
tings at different joint locations. See (Figs . 2 3 and 4)
for specific joint locations and type of tubing flare. The front disc brakes consist of two different types
of caliper assemblies. A double pin Kelsey-Hayes cal-
iper (family caliper) with a bolt-on adapter attached
to the steering knuckle. Or a double pin Kelsey-
Hayes caliper (non-family caliper) which mounts di-
rectly to rails on the steering knuckle. The non-
family caliper is only used on the AY Body
(Imperials).
CAUTION: Caliper pistons, boots and seals for the
different caliper assemblies used on the front and
rear disc brake assemblies are not interchangeable.
Misusage could result in a complete brake system
failure. Be sure that the parts are replaced with the
correct replacement parts, refer to the parts book
for the type and model year of the vehicle being
worked on.
The master cylinder is anodized, lightweight alu-
minum, with a bore size of 24.0mm, 21.0mm or 7/8
inch.
Ä BRAKES 5 - 1

REAR WHEEL DRUM BRAKES INDEX
page page
Brake Drum Refacing ..................... 21
Brake Shoe Assemblies ................... 19 Description
............................. 18
Service Procedures ....................... 18
DESCRIPTION
Rear wheel drum brakes (Fig .2&3)aretwoshoe,
internal expanding type with an automatic adjuster
screw assembly that is activated each time the
brakes are applied. The automatic adjuster screw is
located directly below the wheel cylinder as shown in
figure (Fig .2&3).
WARNING: DUST AND DIRT ON BRAKE PARTS
GENERATED DURING THE NORMAL USE AND
WEAR OF MOTOR VEHICLE BRAKE SYSTEMS MAY
CONTAIN ASBESTOS FIBERS. BREATHING EXCES-
SIVE CONCENTRATIONS OF ASBESTOS FIBERS
CAN CAUSE SERIOUS BODILY HARM, SUCH AS
ASBESTOSIS AND CANCER. EXTREME CARE
SHOULD BE EXERCISED WHILE SERVICING
BRAKE ASSEMBLIES OR COMPONENTS. DO NOT CLEAN BRAKE ASSEMBLIES OR COM-
PONENTS WITH COMPRESSED AIR OR BY DRY
BRUSHING; USE A VACUUM CLEANER SPECIFI-
CALLY RECOMMENDED FOR USE WITH ASBES-
TOS FIBERS. IF A SUITABLE VACUUM CLEANER IS
NOT AVAILABLE, CLEANING SHOULD BE DONE
WET USING A WATER DAMPENED CLOTH. DO NOT CREATE DUST BY SANDING, GRINDING,
AND/OR SHAVING BRAKE LININGS OR PADS UN-
LESS SUCH OPERATION IS DONE WHILE USING
PROPERLY EXHAUST VENTILATED EQUIPMENT. DISPOSE OF ALL DUST AND DIRT SUSPECTED
TO CONTAIN ANY ASBESTOS FIBERS IN SEALED
BAGS OR CONTAINERS TO MINIMIZE DUST EXPO-
SURE TO YOURSELF AND OTHERS. FOLLOW ALL RECOMMENDED PRACTICES PRE-
SCRIBED BY THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION AND THE ENVIRON-
MENTAL PROTECTION AGENCY. FOR THE HAN-
DLING, PROCESSING, AND DISPOSITION OF DUST
OR DIRT WHICH MAY CONTAIN ASBESTOS FI-
BERS. IT IS RECOMMENDED NOT TO BREATH ANY
TYPE OF BRAKE LINING MATERIAL DUST EVEN
ASBESTOS FREE, DUE TO THE FIBROUS NATURE
OF THE MATERIALS BEING USED.
SERVICE PROCEDURES
REAR BRAKE DRUM REMOVAL
If the rear brake drum is difficult to remove, fur-
ther clearance can be obtained by backing off the
brake automatic adjuster screw. Remove rubber plug
from the top of the support plate and rotate the au-
tomatic adjuster screw assembly with an upward mo-
tion, using the Brake Adjuster, Special Tool C-3784. See adjusting rear service brakes in the Service
Adjustments section in this group of the service man-
ual for the specific adjustment procedure. Remove wheel bearing grease cap (Fig. 1).
Remove cotter pin, nut lock, retaining nut, thrust
washer and outer bearing cone (Fig. 1). Remove brake drum and hub and bearing assembly
from the rear spindle (Fig. 1). Inspect brake linings for wear, shoe alignment and
contamination.
BRAKE DRUM INSTALLATION
Install brake drum and hub and bearing assembly
on rear spindle. Install outer wheel bearing, thrust washer and nut.
Tighten wheel bearing adjusting nut to 27 to 34
N Im (240 to 300 in. lbs.) torque while rotating hub.
This seats the bearings. Back off adjusting nut 1/4 turn (90É) then tighten
adjusting nut finger tight. Position lock on nut with one pair of slots in-line
with cotter pin hole. Install cotter pin.
Fig. 1 Brake Drum and Hub Assembly
5 - 18 BRAKES Ä