2004 DAEWOO LACETTI Section 6

4E1 – 6IREAR DISC BRAKES
DAEWOO V–121 BL4
2. Apply a few drops of thread–locking compound to
the caliper bracket mounting bolts and install the
caliper bracket.
Tighten
Tighten the caliper bracket mounting bolts to 56 NSm
(41 lb–ft).
3. Install the brake shoes and the caliper. See ”Cali-
per” in this section.
HUB AND PARKING BRAKE
SHOE/BACKPLATE
Removal Procedure
1. Remove the caliper mounting bracket.
2. Remove the rotor detent screw.
3. Remove the rotor.
4. Remove the rear ABS sensor connector.

REAR DISC BRAKES 4E1 – 11
DAEWOO V–121 BL4
3. Install the bleeder valve and the dust cap.
3. Lubricate a new piston inner seal with brake fluid.
4. Install the piston inner seal into the groove in the
caliper bore.
5. Install the piston dust seal in its groove.
6. Lubricate the piston with brake fluid.
7. Push the piston inward until it is properly seated.
Make sure that the dust seal is in the correct
groove in the piston and the caliper.
8. Reinstall the caliper. Refer to ”Caliper” in this sec-
tion.
9. Bleed the brake system. Refer to Section 4F, Anti–
lock Brake System.

4E1 – 12IREAR DISC BRAKES
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
DISC BRAKE CALIPER ASSEMBLY
The caliper has a single bore and is mounted to the steer-
ing knuckle with two mounting bolts. Hydraulic pressure,
created by applying the brake pedal, is converted by the
caliper to a stopping force. This force acts equally against
the piston and the bottom of the caliper bore to move the
piston outward and to slide the caliper inward, resulting in
a clamping action on the rotor. This clamping action forces
the linings against the rotor, creating friction to stop the ve-
hicle.S Replace all components included in the repair kits
used to service the caliper.
S Lubricate the rubber parts with clean brake fluid to
ease assembly.
S Do not use lubricated shop air on brake parts, as
damage to the rubber components may result.
S If any hydraulic component is removed or discon-
nected, it may be necessary to bleed all or part of
the brake system. Refer to Section 4F, Anti–lock
Brake System.
S Replace the shoes in axle sets only.
S The torque values specified are for dry, unlubri-
cated fasteners.
S Perform the service operations on a clean bench,
free from oily material.

SECTION : 4E2
REAR DRUM BRAKES
TABLE OF CONTENTS
SPECIFICATIONS4E2–1 . . . . . . . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 4E2–1. . . . . . . . .
DIAGNOSIS4E2–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lining Inspection 4E2–1. . . . . . . . . . . . . . . . . . . . . . . . .
Drums 4E2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE AND REPAIR4E2–3 . . . . . . . . . . . . . .
ON–VEHICLE SERVICE 4E2–3. . . . . . . . . . . . . . . . . . . .
Brake Adjustment 4E2–3. . . . . . . . . . . . . . . . . . . . . . . . Shoe and Lining 4E2–4. . . . . . . . . . . . . . . . . . . . . . . . .
Wheel Cylinder Assembly 4E2–7. . . . . . . . . . . . . . . . .
Backing Plate 4E2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
UNIT REPAIR 4E2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel Cylinder 4E2–10. . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION AND SYSTEM
OPERATION4E2–12 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drum Brakes 4E2–12. . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
ApplicationNSmLb–FtLb–In
Brake Line1612–
Brake Wheel Hub/Backing Plate–to–Rear
Axle Nuts2821–
Wheel Cylinder–to–Backing Plate Bolt8–71
DIAGNOSIS
LINING INSPECTION
1. Raise and suitably support the vehicle.
2. Remove the wheel. Refer to Section 2E, Tires and
Wheels.
3. Release the parking brake.
4. Remove the drum. Refer to ” Drum” in this section.
5. Measure the lining thickness. The minimum lining
thickness is 0.5 mm (0.02 inch).
CAUTION : To avoid injury when servicing brake
parts, do not create dust by grinding or sanding the
brake linings or by cleaning the wheel brake parts
with a dry brush or with compressed air.
Important : Replace the shoe and lining assembly in axle
sets only.
6. Install the drum, if removed. Refer to ”One–Piece
Drum” or ”Two–Piece Drum” in this section.
7. Install the wheel, if removed. Refer to Section 2E,
Tires and Wheels.
8. Lower the vehicle.
DRUMS
Whenever brake drums are removed, they should be thor-
oughly cleaned and inspected to see if the drums are
cracked, scored, deeply grooved, or beyond the specified
out–of–round limit.
S A cracked drum is unsafe for further service and-
must be replaced. Do not attempt to weld a cracked
drum. Smooth out any slight scores.
S Heavy or extensive scoring will cause excessive
brake lining wear and may require refinishing the
drum braking surface.
S If the brake linings are slightly worn but are still re-
usable and the drum is grooved, polish the drum
with a fine emery cloth but do not refinish it. Elimi-
nating all grooves in the drum and smoothing the
ridges on the lining would remove too much metal
and lining. If left alone, the grooves and ridges
match, and satisfactory service can be obtained. If
the brake linings need to be replaced, refinish a
grooved drum. A grooved drum, used with a new

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.

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.