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.