2003 DAEWOO MATIZ brakes

2D –14 REAR SUSPENSION
DAEWOO M-150 BL2
D106C708

Install the outer bearing (3).
3. Install the brake drum. Refer to Section 4E, Rear
Drum Brakes.
4. Adjust the end play and free load of the bearing. Re-
fer to “Check and Adjustments” in this section.

REAR SUSPENSION 2D–15
DAEWOO M-150 BL2
SPECIFICATIONS
GENERAL SPECIFICATIONS
Application Unit Description
Suspension Type– Isolated Trailing Link
Maximum Lengthmm (in.) 394.5 ± 3 (15.53 ± 0.12)
Shock Absorber Minimum Lengthmm (in.) 257.5 ± 3 (10.14 ± 0.12)

Shock Absorber
Strokemm (in.) 137 (5.39)
Clearancemm (in.) 0
Rear Wheel Bearing No LoadNm (lb-in.) 0.137 – 0.422 (0.9 – 3.7)
Coil Spring Height (No Load)mm (in.) 291 (11.46)
Grease Type (Rear Wheel Bearing and Hub)–M–8143 ANTIF BRG GREASE
FASTENER TIGHTENING SPECIFICATIONS
Application Nm Lb-Ft Lb-In Shock Absorber–to–Body Bracket Nut 45 – 70 33 – 52 – Shock Absorber–to–Rear Axle Bolt 45 – 70 33 – 52 – Trailing Arm–to–Rear Axle Bolt 80 – 90 59 – 66 – Trailing Arm–to–Body Bracket Bolt 70 – 90 55 – 66 – Lateral Rod–to–Body Bracket Bolt 50 – 70 37 – 52 – Lateral Rod–to–Rear Axle Nut 35 – 55 25 – 41 – Rear Axle Castellated Nut* – – – ABS Rear Speed Sensor Retaining Bolt 9 – 13 – 80 – 11 5

Rear Axle Castellated Nut : Refer to Section 4E, Rear Drum Brakes

DAEWOO M-150 BL2
SECTION 4A
HYDRAULIC BRAKES
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 B unless otherwise
noted.
TABLE OF CONTENTS
Description and Operation 4A-2. . . . . . . . . . . . . . . . . .
Warning Lamp Operation 4A-2. . . . . . . . . . . . . . . . . . .
Component Locator 4A-3. . . . . . . . . . . . . . . . . . . . . . . .
Brake System (Non-ABS) 4A-3. . . . . . . . . . . . . . . . . .
Diagnostic Information and Procedures 4A-4. . . . .
Brake System Testing 4A-4. . . . . . . . . . . . . . . . . . . . . .
Brake Hose Inspection 4A-4. . . . . . . . . . . . . . . . . . . . .
Warning Lamp Operation 4A-5. . . . . . . . . . . . . . . . . . .
Brake System Fault 4A-5. . . . . . . . . . . . . . . . . . . . . . . .
Manual Bleeding the Brakes 4A-6. . . . . . . . . . . . . . . .
Pedal Travel Check 4A-6. . . . . . . . . . . . . . . . . . . . . . . .
Brake Pedal Free Play Inspection 4A-7. . . . . . . . . . . Repair Instructions 4A-8. . . . . . . . . . . . . . . . . . . . . . . . .
On-Vehicle Service 4A-8. . . . . . . . . . . . . . . . . . . . . . . . . .
Brake Hose (Front) 4A-8. . . . . . . . . . . . . . . . . . . . . . . .
Brake Hose (Rear) 4A-9. . . . . . . . . . . . . . . . . . . . . . . .
Stoplamp Switch 4A-9. . . . . . . . . . . . . . . . . . . . . . . . . .
Brake Pedal 4A-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 4A-13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Specifications 4A-13. . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 4A-13. . . . . . . . . .
Schematic and Routing Diagrams 4A-14. . . . . . . . . .
Brake Lamp Warning Circuit 4A-14. . . . . . . . . . . . . . .
Stoplamp Switch Circuit 4A-14. . . . . . . . . . . . . . . . . . .

4A – 2 HYDRAULIC BRAKES
DAEWOO M-150 BL2
DESCRIPTION AND OPERATION
WARNING LAMP OPERATION
This brake system uses a BRAKE warning lamp located
in the instrument panel cluster. When the ignition switch
is in the III position, the BRAKE warning lamp should il-
luminate. It should go off when the ignition switch return
to II position. The following conditions will activate the
BRAKE warning lamp.

The lamp should be on whenever the parking brake
applied and the ignition switch is in the II position.

A low fluid level in the master cylinder will turn the
BRAKE warning lamp on.
D17A007A

HYDRAULIC BRAKES 4A–3
DAEWOO M-150 BL2
COMPONENT LOCATOR
BRAKE SYSTEM (NON–ABS)
(Left–Hand Drive Shown, Right–Hand Drive Similar)
MAB4A001
1. Power Booster
2. Power Booster Boot
3. Cotter Pin
4. Clevis
5. Clevis Pin
6. Packing
7. Spacer
8. Master Cylinder Assembly
9. Fluid Reservoir Assembly
10. Reservoir Cap
11. Reservoir
12. Grommet Seal
13. Master Cylinder
14. Proportioning Valve
15. Stoplamp Switch
16. Brake Pedal Assembly
17. Clutch Pedal Spring18. Pedal Bracket Assembly
19. Clutch Pedal Pad
20. Clutch Pedal
21. Cushion
22. Bushing
23. Retaining Ring
24. Spring
25. Brake Pedal Pad
26. Brake Pedal
27. Brake Pedal Spring
28. Accelator Pedal Pad
29. Accelator Pedal
30. Rear Drum Brake Hose
31. E Ring
32. Front Disc Brake Hose
33. Brake Hose Coupling Bolt
34. Plain Washer

4A –4 HYDRAULIC BRAKES
DAEWOO M-150 BL2
DIAGNOSITIC INFORMATION AND PROCEDURES
BRAKE SYSTEM TESTING
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Brakes should be tested on a dry, clean, reasonably
smooth and level roadway. A true test of brake perfor-
mance cannot be made if the roadway is wet, greasy, or
covered with loose dirt whereby all tires do not grip the
road equally. Testing will also be adversely affected if the
roadway is crowned so as to throw the weight so roughly
that the wheels tend to bounce.
Test the brakes at different vehicle speeds with both light
and heavy pedal pressure; however, avoid locking the
brakes and sliding the tires. Locked brakes and sliding
tires do not indicate brake efficiency since heavily
braked, but turning, wheels will stop the vehicle in less
distance than locked brakes. More tire-to-road friction is
present with a heavily braked, turning tire than with a
sliding tire.
Because of the high deceleration capability, a firmer
pedal may be felt at higher deceleration levels.
There are three major external conditions that affect
brake performance:

Tires having unequal contact and grip of the road will
cause unequal braking. Tires must be equally in-
flated, and the tread pattern of the right and the left
tires must be approximately equal.

Unequal loading of the vehicle can affect the brake
performance since the most heavily loaded wheels
require more braking power, and thus more braking
effort, than the others.

Misalignment of the wheels, particularly conditions of
excessive camber and caster, will cause the brakes
to pull to one side.
To check for brake fluid leaks, hold constant foot pres-
sure on the pedal with the engine running at idle and the
shift lever in NEUTRAL. If the pedal gradually falls away
with the constant pressure, the hydraulic system may be
leaking. Perform a visual check to confirm any sus-
pected leaks.
Check the master cylinder fluid level. While a slight drop
in the reservoir level results from normal lining wear, an
abnormally low level indicates a leak in the system. The
hydraulic system may be leaking either internally or ex-
ternally. Refer to the procedure below to check the mas-
ter cylinder. Also, the system may appear to pass this
test while still having a slight leak. If the fluid level is nor-
mal, check the vacuum booster pushrod length. If an in-
correct pushrod length is found, adjust or replace the
rod.Check the master cylinder using the following proce-
dure:

Check for a cracked master cylinder casting or brake
fluid leaking around the master cylinder. Leaks are in-
dicated only if there is at least one drop of fluid. A
damp condition is not abnormal.

Check for a binding pedal linkage and for an incorrect
pushrod length. If both of these parts are in satisfac-
tory condition, disassemble the master cylinder and
check for an elongated or swollen primary cylinder or
piston seals. If swollen seals are found, substandard
or contaminated brake fluid should be suspected. If
contaminated brake fluid is found, all the components
should be disassembled and cleaned, and all the rub-
ber components should be replaced. All of the pipes
must also be flushed.
Improper brake fluid, or mineral oil or water in the fluid,
may cause the brake fluid to boil or cause deterioration
of the rubber components. If the primary piston cups in
the master cylinder are swollen, then the rubber parts
have deteriorated. This deterioration may also be evi-
denced by swollen wheel cylinder piston seals on the
drum brake wheels.
If rubber deterioration is evident, disassemble all the hy-
draulic parts and wash the parts with alcohol. Dry these
parts with compressed air before reassembly to keep al-
cohol out of the system. Replace all the rubber parts in
the system, including the hoses. Also, when working on
the brake mechanisms, check for fluid on the linings. If
excessive fluid is found, replace the linings.
If the master cylinder piston seals are in satisfactory
condition, check for leaks or excessive heat conditions.
If these conditions are not found, drain the fluid, flush the
master cylinder with brake fluid, refill the master cylin-
der, and bleed the system. Refer to “Manual Bleeding
the Brakes” in this section.
BRAKE HOSE INSPECTION
The hydraulic brake hoses should be inspected at least
twice a year. The brake hose assembly should be
checked for road hazard damage, cracks, chafing of the
outer cover, and for leaks or blisters. Inspect the hoses
for proper routing and mounting. A brake hose that rubs
on a suspension component will wear and eventually
fail. A light and a mirror may be needed for an adequate
inspection. If any of the above conditions are observed
on the brake hose, adjust or replace the hose as neces-
sary.

HYDRAULIC BRAKES 4A–5
DAEWOO M-150 BL2
WARNING LAMP OPERATION
This brake system uses a BRAKE warning lamp located
in the instrument panel cluster. When the ignition switch
is in the III position, the BRAKE warning lamp should
glow and then go OFF when the ignition switch returns
to the II position.The following conditions will activate the BRAKE lamp:

Parking brake applied. The light should be on when-
ever the parking brake is applied and the ignition
switch is II.

Low fluid level. A low fluid level in the master cylinder
will turn the BRAKE lamp ON.
BRAKE SYSTEM FAULT
Condition Probable cause Correction
Brake Warning Lamp ON
Brake fluid leaks.
Repair the leaks or add th fluid.

Parking brake switch shorted to
ground.
Repair the short ground.

Faulty the fluid level sensor.
Replace the sensor.
Stoplamp ON
Faulty the stoplamp switch.
Replace the stoplamp switch.

Push rod length is short.
Adjust the push rod length of the
power booster.

Stoplamp switch circuit shorted to
battery.
Repair or Replace the wiring harness.
Poor Braking
Brake fluid lacks or leaks.
Repair the leaks or add the fluid.

Brake fluid contamination.
Replace the fluid.

Air in the brake system.
Bleed the brake system.

Damaged brake lines.
Replace the brake lines.

Damaged vacuum hose or faulty
check valve.
Replace the vacuum hose or check
value.
Dragging Brake
No free play at the brake pedal.
Adjust the free play.

Weakened the brake pedal return
spring.
Replace the return spring.

Faulty master cylinder.
Replace the master cylinder.

Air in the brake system.
Bleed the brake system.
Pedal Over Stroke
Brake fluid lacks or leaks.
Repair the leaks or add the fluid.

Poor adjustment of the brake pedal
free play.
Adjust the push rod length of the
power booster.

4A –6 HYDRAULIC BRAKES
DAEWOO M-150 BL2
MANUAL BLEEDING THE BRAKES
Important: The bleeding sequence is as follows; right
rear, left rear, right front, and left front.
Important: Check the fluid level and add the fluid during
the bleeding operation.
1. Raise the vehicle.
2. Remove the bleeder screw and cap.
D17B703B
3. Attach a transparent tube over the valve. Allow the
tube to hang submerged in brake fluid in a transpar-
ent container.
D107A303
4. Slowly push the brake pedal several times and hold
the brake pedal.5. Tighten the bleeder screw after loosening the bleeder
screw and draining the fluid.
Caution: Hold the brake pedal until tightening the
bleeder screw.
6. Repeat the step 5, 6 until all the air is removed.
7. Check the leaks for the bleeder screw.
PEDAL TRAVEL CHECK
1. Start the engine.
2. Push the pedal three times.
3. With brake pedal depressed with a about 30Kg (66.15
lb) load, measure the clearance between the pedal
pad and the lower dash panel.
Unit : mm (in.)

Specification

60 (2.36)
D107A304
4. If clearance is less than 60mm (2.36 in.), the most
possible cause is either rear drum brake shoes are
worn out beyond the specification value or air is in
lines. Clearance still remains less than 60mm (2.36
in.) even after replacement of brake shoes and bleed-
ing of the brake system, other possible but infrequent
cause is malfunction of rear drum brake shoe adjust-
ers or booster push rod length out of adjustment.
5. Automatic clearance adjuster check is performed af-
ter removing brake drums. If the faulty is found, repair
or replace it.