2003 DAEWOO MATIZ brakes

4E –8 REAR DRUM BRAKES
DAEWOO M-150 BL2
D107C508
4. Disconnect the parking brake cable from the trailing
shoe and remove the trailing shoe (7).
D107C509
Installation Procedure
1. Install in the reverse of removal.
2. Clean the adjust assembly and apply grease.
3. Connect the parking brake cable from the trailing
shoe.
4. Install the brake shoe.
5. Install the return spring.

Install the middle return spring and adjust lever.

Install the lower return spring.

Install the upper return spring bracket.

Install the upper return spring.
6. Install the brake drum. Refer to “Brake Drum” in this
section.
D107C510
WHEEL CYLINDER ASSEMBLY
Removal Procedure
1. Remove the brake drum. Refer to “Rear Brake Drum”
in this section.
2. Remove the wheel cylinder.

Remove the brake shoe upper spring (1).

Widen the leading shoe and trailing shoe (2).
D107C511

Disconnect the brake line fitting (3).

Plug the opening in the brake line to prevent fluid
loss or contamination.

Remove the wheel cylinder–to–backing plate bolt
(4).

REAR DRUM BRAKES 4E–9
DAEWOO M-150 BL2
D17C512A
Installation Procedure
1. Install the wheel cylinder to the backing plate with the
wheel cylinder bolt (1).
Tighten
Tighten the wheel cylinder–to–backing plate bolt to 10
Nm (89 lb-in).
2. Connect the brake line fitting (2).
Tighten
Tighten the brake line fitting to 16 Nm (12 lb-ft).
3. Install the brake shoe. Refer to “Brake Shoe” in this
section.
4. Install the brake drum. Refer to “Rear Brake Drum” in
this section.
D107C513
BACKING PLATE
Removal Procedure
1. Remove the brake drum. Refer to “Rear Brake Drum”
in this section.
2. Remove the brake shoe components. Refer to “Brake
Shoe” in this section.
3. Remove the wheel cylinder assembly. Refer to “Wheel
Cylinder Assembly” in this section.
4. Remove the bolts and the backing plate.
D17C514A
Installation Procedure
1. Install the bolts and the backing plate.
Tighten
Tighten the backing plate–to–rear axle bolts to 24
Nm (18 lb-ft).
2. Install the wheel cylinder assembly. Refer to “Wheel
Cylinder Assembly” in this section.
3. Install the brake shoe components. Refer to “Brake
Shoe” in this section.
4. Install the brake drum.

4E –10 REAR DRUM BRAKES
DAEWOO M-150 BL2
UNIT REPAIR
D107C701
WHEEL CYLINDER
Disassembly Procedure
1. Remove the wheel cylinder assembly. Refer to “Wheel
Cylinder Assembly” in this section.
2. Disassemble wheel cylinder assembly.

Remove the dust boots and do not reuse them (1).

Remove the piston (2).

Remove the piston cup and do not reuse it (3).

Remove the spring assembly (4).

Remove the bleeder screw (5).
3. Clean all parts with denatured alcohol. Dry the parts
with unlubricated compressed air.
D17C702A
Assembly Procedure
Important: Lubricate the new seals, the piston, the pis-
ton cup and the wheel cylinder bore with clean brake
fluid before assembly.
1. Assemble wheel cylinder assembly.

Insert the bleeder screw.
Tighten
Tighten the bleeder screw to 6 Nm (53 lb-in).

Install the spring and the new piston cup.

Install the piston and the new boots.
2. Inspect the piston for free movement.
3. Install the wheel cylinder assembly. Refer to “Wheel
Cylinder Assembly” in this section.

REAR DRUM BRAKES 4E–11
DAEWOO M-150 BL2
SPECIFICATIONS
GENERAL SPECIFICATIONS
Application Unit Description
Inside Diameter mm (in.) 180 (7.086)
Wear Limit mm (in.) 182 (7.165)
Drum Out of Round mm (in.) 0.04 (0.001)
Cylindricty mm (in.) 0.02 (0.0008)
Thickness mm (in.) 4 (0.157)
Brake Lining Wear Limit mm (in.) 1 (0.039)

Brake Lining
Distance Between Lining and Drum mm (in.) 0.3 (0.011)
Wheel Cylinder Inside Diameter mm (in.) 17.46 (0.687)
FASTENER TIGHTENING SPECIFICATIONS
Application Nm Lb-Ft Lb-In
Castellated Nut* – – –
Wheel Cylinder Bolt 10 – 89
Brake Backing Plate Bolt 24 18 –
Brake Pipe Fitting 16 12 –
Bleeder Screw 6 – 53

Castellated Nut : 25 Nm – 180 + 2.5 Nm (18 lb-ft – 180 + 22 lb-in.)

ANTILOCK BRAKE SYSTEM 4F–3
DAEWOO M-150 BL2
DESCRIPTION AND OPERATION
ABS SYSTEM COMPONENTS
The Antilock Braking System (ABS) consists of a con-
ventional hydraulic brake system plus antilock compo-
nents. The conventional brake system includes a
vacuum booster, master cylinder, front disc brakes, rear
drum brakes, interconnecting hydraulic brake pipes and
hoses, brake fluid level sensor and the BRAKE indicator.
The ABS components include a hydraulic unit, an elec-
tronic brake control module (EBCM), two system fuses,
four wheel speed sensors (one at each wheel), intercon-
necting wiring, the ABS indicator, and the rear drum
brake. See “ABS Component Locator” in this section for
the general layout of this system.
HYDRAULIC UNIT
The hydraulic unit with the attached EBCM is located
between the surge tank and the fire wall on the right side
of the vehicle. The basic hydraulic unit configuration
consists of return pump motor, return pump, four isola-
tion valves, four dump valves, two Low Pressure Accu-
mulators (LPA), two High Pressure Attenuators (HPA).
The hydraulic unit controls hydraulic pressure to the
front calipers and rear wheel cylinders by modulating hy-
draulic pressure to prevent wheel lockup.
Isolation valve
The isolation valve is placed in the brake fluid path from
the master cylinder to the relevant brake caliper and al-
lows free flow as commanded by the driver during nor-
mal braking and reapply phases.
In the isolation phase the coil moves the armature down,
which closes the normally open isolation orifice and pre-
vents any further increase of pressure in the brake. The
valve also remains closed during the dump phase.
The lip seal provides a one way return path for brake
fluid to flow through in:
1. Foot off pedal during isolation.
2. Residual LPA fluid.
D107E002
Dump Valve
The dump valve creates a flow path from the isolation
cartridge (brake side) to the low pressure accumulator
(LPA). The valve keeps this path permanently closed ex-
cept during the dump phase in the ABS mode. On ac-
tivation (dump phase), the coil moves up the armature
which opens the normally closed dump orifice and allow
to drain the pressure in the brake line with the brake fluid
flowing into the LPA.
The lip seal provides a return path for residual brake
fluid in the LPA.
D107E003
Low Pressure Accumulator (LPA)
LPA provides a variable chamber for brake fluid to be
quickly pushed in through the dump valve at the begin-
ning of a departure. This chamber then acts as a reser-
voir which buffers the pump.
D107E004
High Pressure Attenuator (HPA)
The HPA is in between the pump and the ISO valve
(master cylinder side) and uses the bulk mode of the
contained plastic damper and orifice size to dump out
the pressure oscillations from the pump to reduce the

4F–10 ANTILOCK BRAKE SYSTEM
DAEWOO M-150 BL2
Master Cylinder
High Pressure Attenuator
Return Pump Motor
Return Pump Return Pump
Low Pressure
Accumulator
RRFL FR
RL
D17E208A
RR
Isolation Valve
Low
Pressure
AccumulatorFL
Isolation Valve
RR Dump ValveFL
Dump
ValveFR
Isolation Valve
FR Dump ValveRL
Dump
ValveRL
Isolation
Valve High Pressure Attenuator
REAPPLY MODE (PRESSURE INCREASE)
This reapply sequence is initiated to obtain optimum braking. The isolation valve is momentarily pumped open to allow
master cylinder and pump pressure to reach the brakes. This controlled pressure rise continues unitl the wheel is at
optimum brake output or until the brake pressure is brough up to the master cylinder output pressure.
If more pressure is required, more fluid is drawn from the master cylinder and applied to the brakes. The driver may
feel slight pedal pulsations, or pedal drop, this is normal and expected.
As fluid is reapplied to the wheel, they begin to slow down. If they approach imminent lockup again, the EBCM will
isolate, dump and reapply again. The control cycle (isolation, dump, reapply) occurs in milli-second intervals, allowing
seveal cycles to occur each second.
It is a much faster and more controlled way of “pumping the pedal”.

4F–12 ANTILOCK BRAKE SYSTEM
DAEWOO M-150 BL2
VISUAL IDENTIFICATION
EBCM CONNECTOR FACE VIEW
Terminal 9 is identified as they appear from the wire entry end of the harness connector.
EBCM Connector
D107E204
 
 Pin
 
 Signal Name
 
 Color
 
 Circuit
 2 ROUGH ROAD GRY/YEL Buffered Wheel Speed Signal : to ECM–55
(Sirius D3)
 
9
 
RRWSHI
 
BRN
 
Right Rear Wheel Speed High 
 10
 
 RRWSLO
 
 WHT
 
 Right Rear Wheel Speed Low
 11 SDLUART BRN/DK GRN Serial Data Link
 12 RFWSHI DK GRN/BLK Right Front Wheel Speed High
 13 RFWSLO BRN/DK GRN Right Front Wheel Speed Low
 14 LFWSHI DK BLU Left Front Wheel Speed High
 15 IGN RED/YEL Switched Ignition
 16 GND BLK Negative Battery Terminal 17 BATT RED Battery 18 BATT RED Battery 
 19
 
 GND
 
 BLK
 
 Negative Battery Terminal
 20 ABSWARN DK GRN/GRY ABS Warning Indicator
 22 LRWSHI BLK Left Rear Wheel Speed High
 23 LRWSLO RED Left Rear Wheel Speed Low
 24 BRAKESW YEL Brake Switch
 25 LFWSLO YEL Left Front Wheel Speed Low