Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual — part 216

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) are two shoe,

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 (90°) 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

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BRAKES

Ä

Install grease cap and wheel and tire assemblies.

Tighten wheel stud nuts to 115 N

Im (85 ft. lbs.)

torque on all models. Install wheel covers.

BRAKE SHOE ASSEMBLIES

Three brake shoe assemblies are used on the front

wheel drive passenger cars. Vehicles will have axle
sets of either 200 or 220 mm Kelsey Hayes (Fig. 2),
or Varga (Fig. 3). Varga brake shoes are HANDED
for right or left side.

Except for brake shoe to support plate, park brake

lever retention and automatic adjuster positioning
guide buttons, service procedures for either assembly
are essentially the same.

REMOVAL

Remove automatic adjuster spring and lever (Fig.

4).

Rotate the automatic adjuster screw assembly so

that each shoe assembly moves out far enough to be
free from the wheel cylinder boots (Fig. 5).

Disconnect the parking brake cable from the park-

ing brake lever (Fig. 6).

Fig. 2 Kelsey Hayes 200 And 220 (Left) Rear Wheel

Brake

Fig. 3 Varga (Left) Rear Wheel Brake

Fig. 4 Remove or Install Adjuster Lever Spring

Fig. 5 Expand or Retract Adjuster Screw

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BRAKES

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Kelsey Hayes—Leading/trailing shoes; Remove

holddown springs (Fig. 7). Pull assembly down and
away to remove shoes from support plate (Fig. 8). Re-
move brake shoe springs and adjusting screw assem-
bly.

Varga—Leading shoe; Remove the upper shoe to

shoe return spring (Fig. 3). The leading shoe hold
down spring (Fig. 7). And the shoe to shoe spring at
the anchor plate (Fig. 3). Remove shoe and adjuster
assembly.

Varga—Trailing shoe; Remove holddown spring

and lower shoe-to-anchor plate spring.

Kelsey Hayes: Remove park brake lever from

trailing brake shoe by disengaging the retainer clip
(Fig. 9). Be sure not to lose park brake lever wave
washer.

CLEANING AND INSPECTION

Clean metal portion of brake shoes. Check to see if

shoes are bent.

Lining should show contact across entire width and

from heel to toe, otherwise replace.

Shoes with lack of contact at toe or heel maybe im-

properly ground.

Clean and inspect support and adjusting screws.

Apply a thin coat of Mopar Multi-Purpose Lubricant
or equivalent to the threads of the self adjuster (Fig.
10). Replace adjusting screw if corroded.

Fig. 6 Disconnect Parking Brake Cable

Fig. 7 Remove or Install Holddown Springs

Fig. 8 Remove or Install Brake Shoes

Fig. 9 Remove or Install Park Brake Lever Retainer

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BRAKES

Ä

If old springs have overheated or are damaged, re-

place. Overheating indications are paint discoloration
or distorted end coils. Varga brake springs are not
painted but overheating of the brake springs will be
noted by any Blueing of the springs.

BRAKE SHOE INSTALLATION

Lubricate the eight shoe contact areas on the sup-

port plate and anchor using Mopar Multi-Purpose
Lubricant or equivalent (Fig. 11).

KELSEY HAYES REASSEMBLE

Assemble the park brake lever and wave washer to

the new replacement shoe (Fig. 9).

Attach upper return spring between the two new

shoe assemblies.

Apply a small amount of Mopar Multi-Purpose Lu-

bricant or equivalent to the automatic adjuster screw
assembly. Install adjuster with the two stepped forks
facing toward the outboard side of the shoes (Fig.
10). The longer fork will be pointing to the rear.

Connect the lower shoe to shoe spring.

Expand the automatic adjuster so that the end of the

shoes will clear the wheel cylinder boots. Position the
brake shoe assemblies on support plate and install
holddown springs (Fig. 7).

Install self adjuster lever and spring.
Connect park brake cable.
Adjust brake shoes so that they will not interfere

with the drum installation.

CAUTION: Make sure the adjuster screw nut contacts
the adjuster tubular strut.

Install the drums and pump the brake pedal

several times to partially complete the shoe ad-
justment.

After adjusting the Parking brake cable (see Adjust-

ing Parking Brake), road test vehicle. The automatic
adjuster will continue the brake adjustment during the
test.

VARGA REASSEMBLE

(1) Install park brake cable in park brake lever of

trailing shoe.

(2) Attach trailing shoe, then leading shoe lower

springs to shoes and anchor plate.

(3) Position shoes on support plate and install hold-

down springs.

(4) Install automatic adjusters. Left side adjuster

has left hand threads and right side adjuster has
right-hand threads. Do not interchange sides.
Make sure adjuster is installed correctly. (Adjuster
ends must be above extruded pins in web of shoe as
shown in Fig. 3).

(5) Install upper shoe to shoe spring. Ensure that

the spring terminal ends are fully engaged in the shoe
webs.

(6) Rotate serrated adjuster nut to remove free play

from the adjuster assembly.

(7) Install the adjuster lever on the leading shoe

pivot pin. Then attach the short end of the adjuster
spring into the hole on the lever. Then install the long
end of the spring in the leading shoe hole.

(8) Connect park brake cable and adjust brake shoes

so as not to interfere with drum installation.

BRAKE DRUM REFACING

Measure drum runout and diameter. If not to speci-

fication, reface drum. (Runout should not exceed
0.1524 mm or 0.006 inch). The diameter variation (oval
shape) of the drum braking surface must not exceed
either 0.0635 mm (0.0025 inch) in 30° or 0.0889 mm
(0.0035 inch) in 360°.

All drums will show markings of maximum allowable

diameter (Fig. 12).

Fig. 10 Adjuster Screw and Lever (Typical)

Fig. 11 Shoe Contact Areas on Support Plate

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BRAKES

5 - 21