Daewoo Nubira. Manual — part 50
HYDRAULIC BRAKES 4A – 7
DAEWOO V–121 BL4
Brake Lamp Warning Circuit Diagnosis
Step
Action
Value(s)
Yes
No
1
Turn the ignition ON.
Is the brake warning lamp always on?
Go toStep 2
Go toStep 18
2
Check the ABS warning lamp.
Is the ABS warning lamp also on?
Go toStep 3
Go toStep 4
3
Use a scan tool to check for diagnostic trouble codes
(DTCs) and follow the procedures for any DTCs
found.
Is the lamp still on?
Go toStep 4
System OK
4
Release the parking brake fully.
Is the lamp off?
System OK
Go toStep 5
5
Check the brake fluid level.
Is the fluid level OK?
Go toStep 7
Go toStep 6
6
1. Fill the brake fluid reservoir with clean DOT 3
equivalent hydraulic fluid.
2. Replace the cap on the fluid reservoir.
Is the lamp on?
Go toStep 7
System OK
7
Disconnect the harness connector from the brake
fluid level switch.
Is the lamp on?
Go toStep 9
Go toStep 8
8
Replace the brake fluid level switch.
Is the repair complete?
System OK
9
1. Connect the brake fluid level switch.
2. Disconnect the parking brake switch.
Is the lamp on?
Go toStep 11
Go toStep 10
10
Replace the parking brake switch.
Is the repair complete?
System OK
11
Connect the parking brake switch.
Is the vehicle equipped with ABS?
Go toStep 12
Go toStep 14
12
1. Turn the ignition OFF.
2. Disconnect the electronic brake control module
(EBCM) connector.
3. Turn the ignition ON.
Is the lamp on?
Go toStep 14
Go toStep 13
13
Replace the electronic brake control module
(EBCM).
Is the repair complete?
System OK
14
1. Turn the ignition OFF.
2. Connect the EBCM connector.
3. Check for a short to ground in the wiring be-
tween the instrument cluster terminal A2 and
the brake fluid level switch.
Is the problem found?
Go toStep 17
Go toStep 15
15
Check for a short to ground in the wiring between the
instrument cluster terminal A2 and the parking brake
switch.
Is the problem found?
Go toStep 17
Go toStep 16
4A – 8
I
HYDRAULIC BRAKES
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
16
Check for a short to ground in the wiring between the
instrument cluster terminal A2 and the EBCM con-
nector terminal 21.
Is the problem found?
Go toStep 17
Go toStep 18
17
Repair the wiring as needed.
Is the repair complete?
System OK
18
Check the brake lamp after doing each of the follow-
ing functions:
S
Apply the parking brake.
S
Remove the cap from the brake fluid reservoir.
S
On vehicles equipped with ABS, command the
lamp on using a scan tool.
Does the brake warning lamp operate for all of these
conditions?
System OK
Go toStep 19
19
When the operations listed in step 18 were per-
formed, the brake warning lamp did not function.
Did the brake warning lamp fail to light for all of the
operations listed in step 18?
Go toStep 20
Go toStep 27
20
1. Turn the ignition OFF.
2. Inspect the kick panel fuse F5.
Is the fuse OK?
Go toStep 22
Go toStep 21
21
Replace the fuse.
Is the repair complete?
System OK
22
Inspect the brake warning lamp bulb.
Is the bulb OK?
Go toStep 24
Go toStep 23
23
Replace the bulb.
Is the repair complete?
System OK
24
1. Disconnect the instrument cluster connector.
2. Turn the ignition ON.
3. Measure the voltage at the instrument cluster
connector terminal A2.
Does the voltagemeasurewithin the value specified?
11–14 v
Go toStep 25
Go toStep 26
25
1. Turn the ignition OFF.
2. Repair the open in the instrument cluster.
Is the repair complete?
System OK
26
1. Turn the ignition OFF.
2. Repair the open in the wiring between the in-
strument cluster connector terminal A2 and the
ignition switch.
Is the repair complete?
System OK
27
Apply the parking brake again.
Does the parking brake warning lamp operate with
the parking brake applied?
Go toStep 28
Go toStep 30
28
Remove the brake fluid reservoir cap.
Does the parking brake warning lamp operate with
the cap from the brake fluid reservoir removed?
Go toStep 29
Go toStep 32
29
Check for an open between the instrument cluster
connector terminal B13 and the EBCM connector
terminal 21.
Is the problem found?
Go toStep 17
Go toStep 13
HYDRAULIC BRAKES 4A – 9
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
30
1. Turn the ignition ON.
2. Disconnect the parking brake switch.
3. Jumper the parking brake switch connector
terminal to ground.
Is the lamp on?
Go toStep 10
Go toStep 31
31
1. Turn the ignition OFF.
2. Repair the open in the wire between the instru-
ment cluster connector terminal B13 and the
parking brake switch connector terminal.
Is the repair complete?
System OK
32
1. Disconnect the brake fluid level switch.
2. Turn the ignition ON.
3. Jumper the brake fluid level switch connector
terminals.
Is the lamp on?
Go toStep 8
Go toStep 33
33
1. Turn the ignition OFF.
2. Connect a test light between battery positive
and the BRN/WHT wire terminal of the brake
fluid level switch.
Is the test light on?
Go toStep 34
Go toStep 35
34
Repair the open in the wiring between ground and
the brake fluid level switch.
Is the repair complete?
System OK
35
Repair the open in the wiring between the instrument
cluster connector terminal B13 and the brake fluid
level switch.
Is the repair complete?
System OK
4A – 10
I
HYDRAULIC BRAKES
DAEWOO V–121 BL4
MAINTENANCE AND REPAIR
ON–VEHICLE SERVICE
MANUAL BLEEDING THE BRAKES
1. Remove the booster reserve by applying the brakes
several times with the engine OFF until all the re-
serve is depleted.
Important : If the master cylinder is known or suspected
to have air in the bore, then it must be bled before any
wheel cylinder or caliper is bled.
2. Fill the master cylinder reservoir with brake fluid.
Keep the master cylinder at least one–half full of
fluid during the bleeding operation.
3. Disconnect the front brake line(s) at the master cyl-
inder.
4. Allow the brake fluid to fill the master cylinder until it
begins to flow from the front pipe connector port.
5. Connect the front brake line(s) to the master cylin-
der.
Tighten
Tighten the brake lines to 16 N
S
m (12 lb–ft).
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