2004 DAEWOO LACETTI brake

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.

4E2 – 12IREAR DRUM BRAKES
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
DRUM BRAKES
This drum brake assembly is a leading/trailing shoe de-
sign. Both brake shoes are held against the wheel cylinder
pistons by the lower return spring and the fixed anchor
plate near the lower return spring. When the brakes are
applied, the wheel cylinder pistons move both shoes out
to contact the drum. With forward wheel rotation, the for-
ward brake shoe will wrap into the drum and become self–
energized. With reverse wheel rotation, the rear brake
shoe is self–energized. Force from the brake shoes is
transferred to the anchor plate through the backing plate
to the axle flange. Adjustment is automatic and occurs on
any service brake application. Do not switch the positionof shoes that have been in service, as this may render the
self–adjustment feature inoperative and result in in-
creased pedal travel.
Notice : To avoid damaging the vehicle, observe the fol-
lowing directions:
S Replace all the components included in the repair
kits used to service this drum brake.
S Do not use lubricated shop air on the 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 braking system.
S Replace the shoe and linings in axle sets only.
S The torque values specified are for dry, unlubri-
cated fasteners.
S Perform service operations on a clean bench that is
free from all mineral oil materials.

SECTION : 4F
ANTILOCK BRAKE SYSTEM
CAUTION : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool
or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help
prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.
TABLE OF CONTENTS
SPECIFICATIONS4F–2 . . . . . . . . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 4F–2. . . . . . . . . .
SPECIAL TOOLS4F–2 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools Table 4F–2. . . . . . . . . . . . . . . . . . . . . . . .
SCHEMATIC AND ROUTING DIAGRAMS4F–3 . . . . .
Abs System Circuit (I) 4F–3. . . . . . . . . . . . . . . . . . . . . .
Abs System Circuit (II) 4F–4. . . . . . . . . . . . . . . . . . . . .
Ebcm Connector Face View 4F–5. . . . . . . . . . . . . . . . .
COMPONENT LOCATOR4F–6 . . . . . . . . . . . . . . . . . . . .
ABS/EBD System Drive 4F–6. . . . . . . . . . . . . . . . . . . .
DIAGNOSIS4F–7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Circuit Check 4F–7. . . . . . . . . . . . . . . . . . .
ABS Indicator Lamp Inoperative 4F–9. . . . . . . . . . . . .
Power Supply to Control Module,
No DTCs Stored 4F–12. . . . . . . . . . . . . . . . . . . . . . . .
ABS Indicator Lamp Illuminated Continuously,
No DTCs Stored 4F–16. . . . . . . . . . . . . . . . . . . . . . . .
Electronic Brake–Force Distribution (EBD)
System Indicator Lamp Inoperative 4F–18. . . . . . . .
SELF–DIAGNOSTICS 4F–22. . . . . . . . . . . . . . . . . . . .
DISPLAYING DTCs 4F–22. . . . . . . . . . . . . . . . . . . . . . .
CLEARING DTCs 4F–22. . . . . . . . . . . . . . . . . . . . . . . .
INTERMITTENTS AND POOR
CONNECTIONS 4F–22. . . . . . . . . . . . . . . . . . . . . . . .
DTC C0035 Left Front Wheel Speed Sensor
Circuit Malfunction 4F–23. . . . . . . . . . . . . . . . . . . . . .
DTC C0040 Right Front Wheel Speed Sensor
Circuit Malfunction 4F–26. . . . . . . . . . . . . . . . . . . . . .
DTC C0045 Left Rear Wheel Speed Sensor
Circuit Malfunction 4F–29. . . . . . . . . . . . . . . . . . . . . .
DTC C0050 Right Rear Wheel Speed Sensor
Circuit Malfunction 4F–32. . . . . . . . . . . . . . . . . . . . . .
DTC C0060/C0065 Left Front Inlet and
Outlet Valve Solenoid Fault 4F–35. . . . . . . . . . . . . . .
DTC C0070/C0075 Right Front Inlet and
Outlet Valve Solenoid Fault 4F–37. . . . . . . . . . . . . . . DTC C0080/C0085 Left Rear Inlet and
Outlet Valve Solenoid Fault 4F–39. . . . . . . . . . . . . . .
DTC C0090/C0095 Right Rear Inlet and
Outlet Valve Solenoid Fault 4F–41. . . . . . . . . . . . . . .
DTC C0110 Pump Motor Circuit Malfunction 4F–43. .
DTC C0121 Valve Relay Circuit Malfunction 4F–45. .
DTC C0161 ABS Brake Switch Circuit
Malfunction 4F–47. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC C0245 Wheel Speed Sensor Frequency
Error 4F–50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC C0550 ABS Control Module Internal
Fault 4F–54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC C0800 Low Voltage Fault 4F–56. . . . . . . . . . . . .
DTC C0931 Overheated 4F–59. . . . . . . . . . . . . . . . . . .
MAINTENANCE AND REPAIR4F–60 . . . . . . . . . . . . . .
ON–VEHICLE SERVICE 4F–60. . . . . . . . . . . . . . . . . . . .
Service Precautions 4F–60. . . . . . . . . . . . . . . . . . . . . . .
Bleeding System 4F–61. . . . . . . . . . . . . . . . . . . . . . . . .
ABS 5.3 Assembly 4F–61. . . . . . . . . . . . . . . . . . . . . . . .
Front Wheel Speed Sensor 4F–62. . . . . . . . . . . . . . . .
Front Wheel Speed Sensor Jumper Harness 4F–63.
Rear Wheel Speed Sensor 4F–64. . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION AND SYSTEM
OPERATION4F–65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Knowledge Required 4F–65. . . . . . . . . . . . . . . . .
ABS System Components 4F–65. . . . . . . . . . . . . . . . .
Base Braking Mode 4F–65. . . . . . . . . . . . . . . . . . . . . . .
Antilock Braking Mode 4F–66. . . . . . . . . . . . . . . . . . . . .
EBD System 4F–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Brake–Force Distribution (EBD) Failure
Matrix 4F–70. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tires and ABS/EBD 4F–71. . . . . . . . . . . . . . . . . . . . . . .
Electronic Brake Control Module (EBCM) 4F–71. . . .
Front Wheel Speed Sensors 4F–71. . . . . . . . . . . . . . .
Front Wheel Speed Sensor Rings 4F–71. . . . . . . . . . .
Rear Wheel Speed Sensors and Rings 4F–71. . . . . .
Valve Relay and Pump Motor Relay 4F–71. . . . . . . . .

4F – 2IANTILOCK BRAKE SYSTEM
DAEWOO V–121 BL4
Wiring Harness 4F–71. . . . . . . . . . . . . . . . . . . . . . . . . . . Indicators 4F–71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
ApplicationNSmLb–FtLb–In
ABS 5.3 Mounting Nuts1511–
Brake Pipe Nuts2216–
Front Wheel Speed Sensor Bolt8–71
SPECIAL TOOLS
SPECIAL TOOLS TABLE
Scan Tool

ANTILOCK BRAKE SYSTEM 4F – 3
DAEWOO V–121 BL4
SCHEMATIC AND ROUTING DIAGRAMS
ABS SYSTEM CIRCUIT (I)
1
12
2
C111 1 2 2
E B C M
19
16 1418
B+
B+1576 54
G106
10A
62C202 BRN
BRN
BRN
BRN
BRNF11
Hot in Run and Start
6C110 C107 C107
40 C202
60A
1
6C105
C102
RED ORN/
BLK
RED RED
RED
Ground IGN+
Ground LT B L U Brake
Switch2
4Ef215AEf13
Hot at All Times
4330
C201 C201
J3B14F01
11
11
S301
2 WHT GRYGRY
WHT GRY
WHT PPL
YEL
WHTWHT
RED
BRN BRN
BLK BLK
DK
BLUBRN LT
BLU
1
21 4 5
10 89 3
31
C110
43
12
C30214C202
LT B L U LT B L U LT B L U
LT B L U
RR/LH
Wheel Speed SensorRR/RH BLK/WHT
G106
BLK
61
C201
76
C201
17
Oil feeding
Connector
”2”Ter
Oil feeding
Connector
”4”Ter
FRT/LHWheel Speed Sensor
FRT/RH
1C110

4F – 4IANTILOCK BRAKE SYSTEM
DAEWOO V–121 BL4
ABS SYSTEM CIRCUIT (II)
60A
REDEf2
2
C107
J3B14F02
Oil feeding
Connector
BLK/WHT
G106
10A30
F4
32 43
A19
A13 A14
S301A1 C201 C201
31C201 C201 C201
C202
C110
C110
C101
C106C202 WHT
BRN BRN BRN
DLC
(Data Link
Connector) LT GRN
DK
GRN
DK
GRN LT GRN/
BLK
LT GRN/
BLK
LT GRN
LT GRN LT GRN
LT GRN LT GRN
DK BLU
DK BLUDK BLUDK BLU
DK BLU
DK BLU
ECM
”53” Ter.
(Sirius D4)ECM
”K7” Ter.
(MR–140)PPL/
WHT
PPL/
WHT
WHT/
YELPPL/WHTPPL/WHT
PPL/WHT PPL/WHT ABS
Warning
LampTCS
Warning
LampParking
Brake
Warning
Lamp
Hot in Run and Start
Hot at all times
PNK
Cluster I/P
Fuse
Block
PNK
EBCMBrake Fluid
Switch
”1” Ter.
Parking Brake
Switch 8
88 9
92 20 2222 16
41
3
42
1
11
12
19
12 432
1
21
25 23 11
6C110
C202
10A30
F11
62B15
15 15

ANTILOCK BRAKE SYSTEM 4F – 5
DAEWOO V–121 BL4
EBCM CONNECTOR FACE VIEW
EBCM Connector
PinColorCircuit
1WHTRight Rear Ground
2BRNRight Rear Sensor
3PPLRight Front Ground
4–Not Used
5YELRight Front Sensor
6WHTLeft Front Ground
7ORNLeft Front Sensor
8REDLeft Rear Ground
9BLKLeft Rear Sensor
10–Not Used
11DK BLU/
WHTData Link Connector
(DLC)
12–Not Used
13–Not Used
14YELBrake Lamp Switch
15PNKSwitched Ignition
16BLKMotor Ground
PinColorCircuit
17REDBattery
18REDBattery
19BLK/WHTInstrument Ground
20LT GRNABS Warning Lamp
21BRN/WHTEBD Warning Lamp
(Parking Brake Lamp)
22–Not Used
23–Not Used
24–Not Used
25–WSS Output Signal
26–Not Used
27–Not Used
28–Not Used
29–Not Used
30–Not Used
31–Not Used
SB–Shorting Bar