DAEWOO LACETTI 2004 Service Repair Manual

4E2 – 2IREAR DRUM BRAKES
DAEWOO V–121 BL4
lining, will not only wear the lining, but also will
make it difficult, if not impossible, to obtain proper
brake performance.
S An out–of–round drum makes accurate brake shoe
adjustment impossible and is likely to cause exces-
sive wear of other parts of the brake mechanism.
An out–of–round drum can also cause severe and
irregular tire tread wear, as well as a pulsating
brake pedal.S The extent to which a drum is worn or out of round
can be measured accurately with an inside microm-
eter fitted with the proper extension rods. When
measuring a drum for wear or the extent to which it
is out of round, take measurements from the inside
edge to the outside edge of the machined surface
at 90–degree intervals around the circumference of
the drum. When the drum exceeds the specified
out–of–round limit, refinish the drum.

REAR DRUM BRAKES 4E2 – 3
DAEWOO V–121 BL4
MAINTENANCE AND REPAIR
ON–VEHICLE SERVICE
BRAKE ADJUSTMENT
Removal Procedure
1. Release the parking brake.
2. Operate the brake at least 10 times until the jump-
ing of the adjustment spring on the adjustment nut
can no longer be heard on either brake drum.
3. Raise and suitably support the vehicle.
4. Remove the rear wheels. Refer to Section 2E, Tires
and Wheels.
5. Remove the drum detent screw.
6. Remove the brake drum.
7. Using the rear brake adjuster nut, turn the adjuster
assembly in until there is a sufficient amount of
drag on the brake drum.
8. Make sure that the parking brake lever stops are
against the edge of the shoe web. If they are not,
loosen the parking brake cable at the equalizer. Re-
fer to Section 4G, Parking Brake.

4E2 – 4IREAR DRUM BRAKES
DAEWOO V–121 BL4
Installation Procedure
1. Position the rear brake drum. Fasten the drum det-
ent screw.
Tighten
Tighten the drum detent screw to 4 NSm (35 lb–in).
2. Install the rear wheels. Refer to Section 2E, Tires
and Wheels.
Important : The brake pedal must be operated more than
10 times. When the clicking can no longer be heard, the
clearance between the brake shoe and drum is adjusted.
3. Apply the foot brake several times until the clicking
of the adjustment actuator can no longer be heard.
4. Adjust the parking brake. Refer to Section 4G,
Parking Brake.
SHOE AND LINING
Removal Procedure
1. Raise and suitably support the vehicle.
2. Remove the rear wheels. Refer to Section 2E, Tires
and Wheels.
3. Loosen the parking brake cable. Refer to Section
4G, Parking Brake.
4. Remove the brake drum.
5. Loosen the leading shoe hold–down return spring.
6. Disconnect the upper link of the connecting link
spring of the leading shoe to relieve tension on the
upper return spring.
7. Remove the upper return spring and the adjuster.

REAR DRUM BRAKES 4E2 – 5
DAEWOO V–121 BL4
8. Unfasten the trailing shoe and lining assembly hold-
down return spring.
9. Disconnect the trailing shoe and lining assembly on
the right side.
10. Detach the lower return spring.
Installation Procedure
1. Measure the minimum brake lining thickness. Refer
to ”Lining Inspection” in this section.
2. Clean the adjuster assembly and apply grease.
Notice : If any parts are of questionable strength or quality
because of heat discoloration, excessive stress, or wear,
the shoes, the springs, or the adjuster assembly should be
replaced.
3. Inspect the threads of the adjuster assembly for
smooth rotation.
4. Install the trailing shoe and lining assembly with the
hold–down spring, the washer, and the pin.
5. Make sure the parking brake cable is properly
routed and attached to the shoe lever.
Notice : Do not overstretch the lower return spring.
6. Fasten the lower return spring on the shoe.

4E2 – 6IREAR DRUM BRAKES
DAEWOO V–121 BL4
7. Position the leading shoe and the adjuster assem-
bly against the backing plate.
8. Fasten the lower return spring to the leading shoe.
9. Install the adjuster assembly.
10. Turn the adjuster in as far as possible.
11. Position the spring clip toward the backing plate.
12. Install the leading shoe with the hold–down spring.
13. Attach the leading shoe upper link–spring connec-
tion, which applies tension to the upper return
spring.
Notice : Do not overstretch the upper return spring.
14. Install the upper return spring from the spring con-
necting link to the brake shoe.
Notice : The nut must not lock firmly at the end of the ad-
justment assembly.
15. Before installing the brake drum, make sure the
adjuster assembly nut is drawn all the way to the
stop.

REAR DRUM BRAKES 4E2 – 7
DAEWOO V–121 BL4
16. Install the brake drum and fasten it with the drum
detent screw.
Tighten
Tighten the drum detent screw to 4 NSm (35 lb–in).
17. Install the rear wheels. Refer to Section 2E, Tires
and Wheels.
18. Adjust the rear wheel brakes. Refer to ”Brake Ad-
justment” in this section.
19. Adjust the parking brake. Refer to Section 4G,
Parking Brake.
20. Lower the vehicle.
WHEEL CYLINDER ASSEMBLY
Removal Procedure
1. Raise and suitably support the vehicle.
2. Remove the rear wheels. Refer to Section 2E, Tires
and Wheels.
3. Remove the brake drum.
4. Remove the shoe and lining. Refer to ”Shoe and
Lining” in this section.
5. Clean dirt and foreign material from around the
wheel cylinder brake line inlet, the pilot, and the
bolt.
6. Disconnect the brake line from the wheel cylinder.
7. Plug the opening in the brake line to prevent fluid
loss or contamination.
8. Remove the wheel cylinder–to–backing plate bolt.
9. Gently tap out the wheel cylinder from the backing
plate, using care not to damage the bleeder valve
or its cap.

4E2 – 8IREAR DRUM BRAKES
DAEWOO V–121 BL4
Installation Procedure
1. Install the wheel cylinder to the backing plate with
the wheel cylinder bolt.
Tighten
Tighten the wheel cylinder–to–backing plate bolt to 8
NSm (71 lb–in).
2. Connect the brake line to the wheel cylinder.
Tighten
Tighten the brake line to 16 NSm (12 lb–ft)
3. Install the shoe and lining, and the brake drum. Re-
fer to ”Shoe and Lining” in this section.
4. Bleed the brakes. Refer to Section 4A, Hydraulic
Brakes.
BACKING PLATE
Removal Procedure
1. Raise and suitably support the vehicle.
2. Remove the brake shoe components, including
complete removal of the parking brake with the re-
tainer. Refer to ”Shoe and Lining” in this section
and Section 4A, Hydraulic Brakes.
3. Remove the nuts that secure the wheel hub assem-
bly to the backing plate.
4. Remove the brake line and plug the opening in the
line to prevent fluid loss or contamination.
5. Remove the wheel cylinder assembly. Refer to
”Wheel Cylinder Assembly” in this section.
6. Remove the wheel hub assembly.
7. In case of ABS brake, disconnect the cable that
goes to the wheel speed sensor.
8. Separate the backing plate and the gasket.

REAR DRUM BRAKES 4E2 – 9
DAEWOO V–121 BL4
Installation Procedure
1. Install the hub with bolts.
Tighten
Tighten the hub botls to 65 NSm (48 lb–ft).
2. Install the brake wheel cylinder assembly to the
backing plate. Refer to ”Wheel Cylinder Assembly”
in this section.
3. Connect the brake line.
Tighten
Tighten the brake line to 16 NSm (12 lb–ft).
4. Install the brake components. Refer to ”Shoe and
Lining” in this section.
5. Install the parking brake cable with the retainer by
attaching the cable to the brake shoe lever. Refer to
Section 4G, Parking Brake.
6. Bleed the brakes. Refer to Section 4A, Hydraulic
Brakes.
7. Lower the vehicle.

4E2 – 10IREAR DRUM BRAKES
DAEWOO V–121 BL4
UNIT REPAIR
WHEEL CYLINDER
Disassembly Procedure
1. Remove the wheel cylinder assembly from the
backing plate. Refer to ”Wheel Cylinder Assembly”
in this section.
2. Twist off the boots, the pistons, and the seals from
each end of the wheel cylinder.
3. Remove the spring assembly.
4. Remove the bleeder cap and the bleeder valve.
Assembly Procedure
1. Inspect the wheel cylinder bore and the pistons for
scoring, nicks, corrosion, and wear.
2. Use a crocus cloth to polish out light corrosion in
the wheel cylinder bore.
Important : If the bore will not clean up with a crocus cloth,
replace the assembly.
3. Clean all the parts in clean denatured alcohol or
brake fluid. Dry all the parts with unlubricated com-
pressed air and lubricate the new seals, the pis-
tons, and the wheel cylinder bore with clean brake
fluid before assembly.
4. Thinly coat all the parts except the dust caps with
brake cylinder fluid.
5. Fasten the bleeder valve and the cap to the wheel
cylinder.

REAR DRUM BRAKES 4E2 – 11
DAEWOO V–121 BL4
6. Attach to the wheel cylinder the spring assembly,
followed by the pistons, the seals, and the boots.
7. Inspect the pistons for free movement.
8. Install the wheel cylinder assembly. Refer to ”Wheel
Cylinder Assembly” in this section.