Daewoo Nubira. Manual - part 43

SECTION : 4D

FRONT DISC BRAKES

TABLE OF CONTENTS

SPECIFICATIONS

4D–1

. . . . . . . . . . . . . . . . . . . . . . . . . . 

FASTENER TIGHTENING SPECIFICATIONS

4D–1

. 

DIAGNOSIS

4D–1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

LINING INSPECTION

4D–1

. . . . . . . . . . . . . . . . . . . . . . 

ROTOR INSPECTION

4D–1

. . . . . . . . . . . . . . . . . . . . . 

MAINTENANCE AND REPAIR

4D–3

. . . . . . . . . . . . . . . 

ON–VEHICLE SERVICE

4D–3

. . . . . . . . . . . . . . . . . . . . . 

SHOE AND LINING

4D–3

. . . . . . . . . . . . . . . . . . . . . . . . 

CALIPER

4D–4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

ROTOR

4D–6

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

SPLASH SHIELD

4D–7

. . . . . . . . . . . . . . . . . . . . . . . . . . 

UNIT REPAIR

4D–9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

CALIPER OVERHAUL

4D–9

. . . . . . . . . . . . . . . . . . . . . 

GENERAL DESCRIPTION AND SYSTEM

OPERATION

4D–11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DISC BRAKE CALIPER ASSEMBLY

4D–11

. . . . . . . . 

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Application

N

S

m

Lb–Ft

Lb–In

Brake Hose Inlet Fitting–to–Caliper Bolt

40

30

–

Caliper–to–Steering Knuckle Mounting Bolts

95

70

–

Retaining Frame–to–Caliper Housing Bolts

22–32

16–24

–

Rotor–to–Front Wheel Hub Detent Screw

4

–

35

Splash Shield–to–Steering Knuckle Screws

5

–

44

DIAGNOSIS

LINING INSPECTION

1.  Raise and suitably support the vehicle.
2.  Remove the front wheels. Refer toSection 2E, Tires

and Wheels.

3.  Visually check the linings for minimum thickness

and wear.

4.  Measure the thickness.

Important : The minimum thickness of the inner or outer
pad is 9 mm(0.35 inch).

1.  Install the brake pads in axle sets only.
2.  Install the front wheels. Refer toSection 2E, Tires

and Wheels.

3.  Lower the vehicle.

ROTOR INSPECTION

Thickness variation can be checked by measuring the
thickness of the rotor at four or more points around the cir-
cumference of the rotor. All measurements must be made
at the same distance in from the edge of the rotor.

A rotor that varies by more than 0.005 mm (0.0005 inch)
can cause pedal pulsations and/or front end vibration dur-
ing brake applications. A rotor that does not meet these
specifications should be refinished to specifications or re-
placed.

4D – 2

I

FRONT DISC BRAKES

DAEWOO V–121 BL4

During manufacturing, the brake rotor and the tolerances
of the braking surface regarding flatness, thickness varia-
tion, and lateral runout are held very close. The mainte-
nance of close tolerances on the shape of the braking sur-
faces is necessary to prevent brake roughness.

In addition to these tolerances, the surface finish must be
held to a specified range. The control of the braking sur-
face finish is necessary to avoid pulls and erratic perfor-
mance and to extend lining life.

Using a commercially available dial indicator, check lateral
runout as follows:

Notice : Permissible lateral runout is a maximum 0.03 mm
(0.0012 inch). If lateral runout exceeds the specification,
ensure that there is no dirt between the rotor and the hub
and that contact surfaces are smooth and free from burrs.

1.  Position the transaxle in NEUTRAL.
2.  Remove the rotor. Refer to ”Rotor” in this section.

3.  Fasten the brake rotor to the wheel hub with two

wheel bolts.

4.  Fasten a dial indicator to the brake caliper.
5.  Set the gauge probe tip to approximately 10 mm

(0.39 inch) from the outer edge of the brake rotor,
perpendicular to the disc and under slight preload.

6.  Remove the dial indicator and the wheel bolts con-

necting the rotor to the hub.

Important : Since accurate control of the rotor tolerances
is necessary for proper performance of the disc brakes, re-
finishing of the rotor should be done only with precision
equipment.

7.

If required, refinish the rotor with precision equip-
ment. Discard the rotor if it fails to meet the above
specifications after refinishing. Install the rotor. Re-
fer to ¡

³

Rotor¡

µ

in this section.

8.

Install the rotor. Refer to ”Rotor” in this section.

FRONT DISC BRAKES  4D – 3

DAEWOO V–121 BL4

MAINTENANCE AND REPAIR

ON–VEHICLE SERVICE

SHOE AND LINING

Removal Procedure

1.  Raise and suitably support the vehicle.
2.  To preserve wheel balance, mark the position of the

front wheel relative to the wheel hub. Remove the
front wheel. Refer to Section 2E, Tires and Wheels.

3.  Remove the lower caliper mounting bolt.

Important : Caliper removal is not necessary to service
the brake shoes.

4.  Pivot the caliper upward.

5.  Remove the brake shoes.

4D – 4

I

FRONT DISC BRAKES

DAEWOO V–121 BL4

Installation Procedure

1.  Install the brake shoes.
2.  If new brake shoes are being installed, they will be

thicker than the worn pads that were removed.
Push the caliper piston inward, if necessary.

3.  Pull the caliper downward and install the lower

mounting bolt.

Important : Do not damage the piston dust seal when the
caliper is pulled downward to reinstall the lowermounting
bolt.

Tighten

Tighten the caliper mounting bolt to 22–32 N

S

m

(16–24 lb–ft).

4.  Align the marks that were made when removing the

front wheel, and install the wheel. Refer toSection
2E, Tires and Wheels.

5.  Lower the vehicle.

CALIPER

Removal Procedure

1.  Raise and suitably support the vehicle.
2.  To preserve wheel balance, mark the position of the

front wheel relative to the wheel hubs. Remove the
wheel. Refer toSection 2E, Tires and Wheels.

3.  Remove the bolt which attaches the brake hose to

the caliper. Remove the washers.