Daewoo Nubira. Manual — part 56
SECTION : 4C
POWER BOOSTER
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 thes cable will help
prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.
TABLE OF CONTENTS
SPECIFICATIONS
4C–1
. . . . . . . . . . . . . . . . . . . . . . . . . .
FASTENER TIGHTENING SPECIFICATIONS
4C–1
.
DIAGNOSIS
4C–1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
POWER BOOSTER FUNCTIONAL CHECK
4C–1
. . .
MAINTENANCE AND REPAIR
4C–2
. . . . . . . . . . . . . . .
ON–VEHICLE SERVICE
4C–2
. . . . . . . . . . . . . . . . . . . . .
VACUUM HOSE
4C–2
. . . . . . . . . . . . . . . . . . . . . . . . . . .
POWER BOOSTER ASSEMBLY
4C–3
. . . . . . . . . . . .
GENERAL DESCRIPTION AND SYSTEM
OPERATION
4C–7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
POWER BOOSTER
4C–7
. . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Application
N
S
m
Lb–Ft
Lb–In
Booster–to–Dash Panel Nuts (Right–Hand Drive)
22
16
–
Booster Pushrod Hex Nut
18
13
–
Brake Line Fittings
16
12
–
DIAGNOSIS
POWER BOOSTER FUNCTIONAL
CHECK
1. With the engine stopped, eliminate vacuum in the
booster by pumping the brake pedal several times.
2. Push the pedal down and hold in this position.
3. Start the engine.
4. The booster is OK if the pedal drops further be-
cause of extra force produced.
If the brake pedal does not drop, the vacuum system (vac-
uum hoses, check valve, etc.) is probably defective and
should be checked.
If no defect is revealed by checking the vacuum system,
the defect is in the booster itself.
4C – 2
I
POWER BOOSTER
DAEWOO V–121 BL4
MAINTENANCE AND REPAIR
ON–VEHICLE SERVICE
VACUUM HOSE
Removal Procedure
1. Spread the clip on the vacuum hose connection at
the intake manifold and move the clip slightly to-
ward the brake booster.
2. Pull the hose from the union nut connection. If the
hose does not remove easily or is deteriorated, pry
off and discard the hose.
3. Spread the clip on the vacuum hose connection to
the brake booster, and move the clip clear of the
booster.
4. Remove the vacuum hose.
Installation Procedure
1. Mount the vacuum hose and ensure the connec-
tions are tight on each end.
2. Install the vacuum hose clips.
3. Check the function of the booster. Refer to
the”Power Booster Functional Check”in this sec-
tion.
POWER BOOSTER 4C – 3
DAEWOO V–121 BL4
POWER BOOSTER ASSEMBLY
Removal Procedure
1. Remove the master cylinder. Refer toSection 4B,
Master Cylinder.
2. Remove the brake lines to the hydraulic modulator
for vehicles equipped with ABS.
3. Remove the shaft and the rubber O–ring.
4. Remove the clip on the vacuum hose connection on
the booster.
5. Disconnect the brake stoplamp switch from the
brake pedal bracket.
6. Remove the brake pedal spring.
7. Disconnect the clip and the pushrod pin from the
pedal bracket assembly. Refer toSection 4A, Hy-
draulic Brakes.
4C – 4
I
POWER BOOSTER
DAEWOO V–121 BL4
8. Remove the booster mounting nuts from the studs
protruding from the dash panel and remove the
booster.
9. Remove the rubber boot.
10. Holding the hex nut, twist off the pushrod clevis.
11. Remove the hex nut from the pushrod.
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