Daewoo Nubira. Manual — part 57
POWER BOOSTER 4C – 5
DAEWOO V–121 BL4
Installation Procedure
1. Check the pushrod and the pushrod clevis for dam-
age and proper fit.
2. Install the hex nut and the pushrod clevis on the
booster shaft.
Tighten
Tighten the booster hex nut and the pushrod clevis to
18 N
S
m (13 lb–ft).
3. Measure the distance from the booster to the cen-
ter of the clevis bore.
Important : This measurement should be 203 mm (8 inch-
es).
4. Install the rubber boot on the booster.
4C – 6
I
POWER BOOSTER
DAEWOO V–121 BL4
5. Install the booster and the mounting nuts to the
dash panel.
Tighten
Tighten the booster–to–dash panel nuts to 22 N
S
m
(16 lb–ft).
6. Insert the shaft and the rubber O–ring into the pow-
er booster.
7. Connect the master cylinder to the booster. Refer
toSection 4B, Master Cylinder.
8. Connect the brake line fittings to the hydraulic mod-
ulator, if applicable.
Tighten
Tighten the brake line fittings to 16 N
S
m (12 lb–ft).
9. Install the new vacuum hose to the booster. Refer
to”Vacuum Hose”in this section.
10. Install the hose clamps on the vacuum hose, and
snap the vacuum hose in the revolving clip.
11. Install the pushrod pin to the brake pedal bracket
assembly and connect the clip and the spring. Re-
fer toSection 4A, Hydraulic Brakes.
12. Install the brake stoplamp switch onto the brake
pedal bracket.
POWER BOOSTER 4C – 7
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
POWER BOOSTER
The power booster is a single diaphragm, vacuum oper-
ated unit. When the brakes are not applied, there is no
power assist because equal pressure (vacuum) exists on
both sides of the power booster diaphragm. When the
brakes are applied, vacuum is present on one side of the
diaphragm, and air, at atmospheric pressure, is admitted
to the other side. Power assist is provided when there is
unequal pressure on opposite sides of the diaphragm.
When the brakes are released, atmospheric pressure is
shut off, and the vacuum source creates equal pressure
on both sides of the diaphragm by means of a one–way
valve in the power booster.
Important : If any hydraulic component is removed or dis-
connected, it may be necessary to bleed all or part of the
brake system.
SECTION : 4E
REAR DISC 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 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
4E–1
. . . . . . . . . . . . . . . . . . . . . . . . . .
FASTENER TIGHTENING SPECIFICATIONS
4E–1
.
DIAGNOSIS
4E–2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LINING INSPECTION
4E–2
. . . . . . . . . . . . . . . . . . . . . .
ROTOR INSPECTION
4E–2
. . . . . . . . . . . . . . . . . . . . .
MAINTENANCE AND REPAIR
4E–3
. . . . . . . . . . . . . . .
ON–VEHICLE SERVICE
4E–3
. . . . . . . . . . . . . . . . . . . . .
SHOE AND LINING
4E–3
. . . . . . . . . . . . . . . . . . . . . . . .
CALIPER
4E–4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ROTOR
4E–6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPLASH SHIELD/BACKPLATE AND PARKING
BRAKE LEVER
4E–7
. . . . . . . . . . . . . . . . . . . . . . . . . .
UNIT REPAIR
4E–15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CALIPER OVERHAUL
4E–15
. . . . . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION AND SYSTEM
OPERATION
4E–18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISC BRAKE CALIPER
4E–18
. . . . . . . . . . . . . . . . . . .
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Application
N
S
m
Lb–Ft
Lb–In
Bleeder Valve
11
–
97
Brake Hose Caliper Inlet Bolt
32
24
–
Caliper Bracket Mounting Bolts
56
41
–
Caliper Mounting Bolts
31
23
–
Parking Brake Shoe Hold–Down Spring As-
sembly Screw
3.5
–
31
Rotor Detent Screw
4
–
35
Splash Shield Bolts
25
18
–
Wheel Hub Assembly–to–Spindle Shaft
Castle Nut
25 + 1*
18 + 0.7
–
* Tighten the castle nut up to 1 N
S
m (9 lb–in) as needed to align the castle nut cotter pin notch with the spindle shaft hole.
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