Daewoo Matiz (2003 year). Manual - part 128

4A – 14  HYDRAULIC BRAKES

SCHEMATIC AND ROUTING DIAGRAMS

BRAKE LAMP WARNING CIRCUIT

D17A201B

STOPLAMP SWITCH CIRCUIT

D17A202B

SECTION 4B

MASTER CYLINDER

TABLE OF CONTENTS

Description and Operation

4B-2

. . . . . . . . . . . . . . . . . . 

Master Cylinder

4B-2

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

Proportioning Valve

4B-2

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

Fluid Level Sensor

4B-2

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

Diagnostic Information and Procedures

4B-3

. . . . . 

Checking the Brake Fluid Level

4B-3

. . . . . . . . . . . . . . 

Repair Instructions

4B-4

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

On-Vehicle Service

4B-4

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

Master Cylinder Assembly

4B-4

. . . . . . . . . . . . . . . . . . 

Brake Fluid Reservoir

4B-5

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

Proportioning Valve (For Vehicle With the 

Non–ABS Braking System)

4B-5

. . . . . . . . . . . . . . . 

Brake Fluid Level Switch

4B-6

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

Unit Repair

4B-8

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

Master Cylinder

4B-8

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

Specifications

4B-9

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

Fastener Tightening Specifications

4B-9

. . . . . . . . . . . 

4B – 2  MASTER CYLINDER

DESCRIPTION AND OPERATION

MASTER CYLINDER

The master cylinder is designed for use in a direct–split
system. Front right brake and rear left brake are served
by the primary piston. Front left brake and rear right
brake are served by the secondary piston.

The master cylinder incorporates the functions of the
standard dual master cylinder, plus a low fluid level indi-
cator and the proportioning valve in the non–antilock
braking system.

The proportioning valves limit the outlet pressure to the
rear brakes after a predetermined master cylinder has
been reached.

Important:

D

Replace all the components included in the repair kits
used to service this master cylinder.

D

Lubricate rubber parts with clean brake fluid to ease
assembly.

D

Do not use lubricated shop air on brake parts, as this
may damage rubber components.

D

If any hydraulic component is removed or discon-
nected, it may be necessary to bleed all or part of the
brake system.

D

The torque values specified are for dry, unlubricated
fasteners.

D

Perform all service operations on a clean bench, free
from all traces of mineral oil.

PROPORTIONING VALVE

The proportioning valve limits the outlet pressure to the
rear brakes on the non-ABS after a predetermined mas-
ter cylinder pressure has been reached. This is used
when less rear apply force is needed to obtain optimum
braking and is usually found on disc/drum brake configu-
rations. On ABS-equipped vehicles, refer to Section 4F,
Antilock Brake System.

FLUID LEVEL SENSOR

Fluid level sensor is attached at the brake fluid reservoir.
This sensor will activate the BRAKE light if a low fluid
level condition is detected. Once the fluid level is cor-
rected, the BRAKE light will go out.

MASTER CYLINDER  4B – 3

DIAGNOSTIC INFORMATION AND PROCEDURES

CHECKING THE BRAKE FLUID
LEVEL

1. Check the fluid level.

2. If the fluid level is below MAX, refill the fluid to MAX.

D107A302