M34b Master Cylinder.pdf part of Daewoo Matiz 796cc (My 2003).part01.rar, Service Manual, Wiring Diagram - 16 Part File

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SECTION 4B

MASTER CYLINDER
TABLE OF CONTENTS
Description and Operation . . . . . . . . . . . . . . . . . . Master Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . Proportioning Valve . . . . . . . . . . . . . . . . . . . . . . . . Fluid Level Sensor . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Information and Procedures . . . . . Checking the Brake Fluid Level . . . . . . . . . . . . . . Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . On-Vehicle Service . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-2 4B-2 4B-2 4B-2 4B-3 4B-3 4B-4 4B-4 Brake Fluid Reservoir . . . . . . . . . . . . . . . . . . . . . . Proportioning Valve (For Vehicle With the NonABS Braking System) . . . . . . . . . . . . . . . Brake Fluid Level Switch . . . . . . . . . . . . . . . . . . . Unit Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-5 4B-5 4B-6 4B-8

Master Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-8 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-9 Fastener Tightening Specifications . . . . . . . . . . . 4B-9

Master Cylinder Assembly . . . . . . . . . . . . . . . . . . 4B-4

DAEWOO M-150 BL2

4B 2 MASTER CYLINDER

DESCRIPTION AND OPERATION
MASTER CYLINDER
The master cylinder is designed for use in a directsplit 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 indicator and the proportioning valve in the nonantilock 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 disconnected, 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 master 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 configurations. 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 corrected, the BRAKE light will go out.

DAEWOO M-150 BL2

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

DAEWOO M-150 BL2

4B 4 MASTER CYLINDER

REPAIR INSTRUCTIONS ONVEHICLE SERVICE
MASTER CYLINDER ASSEMBLY
Removal Procedure
1. Remove the air filter assembly. Refer to Section 1B, Engine Mechanical. 2. For vehicles with the nonABS braking system, remove the proportioning valve. Refer to "Proportioning Valve" in this section. 3. Remove the master cylinder. D Disconnect the electrical connector. D Loosen the brake pipe fittings. D Plug the opening in the master cylinder to prevent fluid loss or contamination. Notice: Brake fluid may damage paintwork, if spillage onto paintwork, wash with cold water immediately. D Remove the nuts mounting the master cylinder (3).

MAB4B001

D107A514

Installation Procedure
Important: Use only Daewoo recommended brake fluid. 1. Install the master cylinder assembly with the nuts.

Tighten
Tighten the attaching nuts to 16 NSm (12 lb-ft).

D17A515A

DAEWOO M-150 BL2

MASTER CYLINDER 4B 5
2. Install the brake pipe fittings to the master cylinder.

Tighten
3. 4. Tighten the fittings to 16 NSm (12 lb-ft). Connect the electrical connector. For vehicles with the nonABS braking system, install the proportioning valve. Refer to "Proportioning Valve" in this section. Install the air filter assembly. Refer to Section 1B, Engine Mechanical. Bleed the brake system. Refer to Section 4A, Hydraulic Brakes.

5. 6.
MAB4B002

BRAKE FLUID RESERVOIR
Removal Procedure
1. Remove the fluid level switch connector. Refer to "Brake Fluid Level Switch" in this section. 2. Remove the reservoir. D Drain the brake fluid. D Remove the screw (1). D Remove the fluid reservoir using a flathead screwdriver (2). Notice: Do not force one side strongly to prevent damage of reservoir when removing the reservoir.

D17A517A

Installation Procedure
Important: Use only Daewoo recommended brake fluid. 1. Install the reservoir with the screw.

Tighten
Tighten the screw to 4 NSm (35 lb-ft). 2. Install the fluid level switch connector. Refer to "Brake Fluid Level Switch" in this section. 3. Add brake fluid. 4. Bleed the brake system. Refer to Section 4A, Hydraulic Brakes.
D17A518A

PROPORTIONING VALVE (FOR VEHICLE WITH THE NONABS BRAKING SYSTEM)
1. Remove the proportioning valve. D Loosen the brake pipe fittingstoproportioning valve (1). D Remove the proportioning valve (2). D Plug the opening in the proportioning valve and brake pipe fitting to prevent fluid loss or contamination.
MAB4B003

DAEWOO M-150 BL2

4B 6 MASTER CYLINDER
Notice: Brake fluid may damage paintwork, if spillage onto paintwork, wash with cold water immediately.

Installation procedure
1. Install the proportioning valve (1).

Tighten
Tighten the proportioning valve to 22 NSm (16 lb-ft). 2. Install the brake pipe fitting (2).

Tighten
Tighten the brake pipe fittingtoproportioning valve to 16 NSm (12 lb-ft). 3. Bleed the brake system. Refer to Section 4A, Hydraulic Brakes.
MAB4B004

BRAKE FLUID LEVEL SWITCH
Removal procedure
1. Remove the vacuum hose from the power booster. Refer to Section 4C, Power Booster. 2. Remove the brake fluid level switch. D Remove the brake fluid level switch locking system by the flathead screwdriver (1).

D107A504

D Disconnect the electrical connector (2).

D107A505

DAEWOO M-150 BL2

MASTER CYLINDER 4B 7 Installation procedure
1. Install the brake fluid level switch. 2. Connect the electrical connector. 3. Install the vacuum hose to the power booster. Refer to Section 4C, Power Booster.

D107A506

DAEWOO M-150 BL2

4B 8 MASTER CYLINDER

UNIT REPAIR
MASTER CYLINDER
(ABS Type Master Cylinder is Shown, NonABS Type Master Cylinder is Similar) Disassembly Procedure
1. Remove the master cylinder. Refer to "Master Cylinder Assembly" in this section. 2. Remove the brake fluid reservoir. Refer to "Brake Fluid Reservoir" in this section. 3. Remove the reservoir seals (1). 4. Remove the washer (2).
D24B001

5. Remove the stop pin (3). 6. Remove the boot (1). 7. Remove the retaining ring (2). Notice: When removing the retaining ring, avoid damaging the piston or the cylinder wall. 8. Remove the primary piston (3). 9. Carefully remove the secondary piston assembly and the spring from the master cylinder bore (4).

D24B002

Assembly Procedure
1. Install the secondary piston assembly . 2. Install the stop pin. 3. 4. 5. 6. Install the primary piston. Install the retaining ring. Install the boot. Install the washer.

D24B003

7. Install the reservoir seals. 8. Install the brake fluid reservoir. Refer to "Brake Fluid Reservoir" in this section. 9. Install the master cylinder. Refer to "Master Cylinder Assembly" in this section. 10. Raise and suitably support the vehicle. 11. Bleed the braking system. Refer to Section 4A, Hydraulic Brakes. 12. Lower the vehicle.

DAEWOO M-150 BL2

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Proportioning Valve Brake Pipe Fittings to Front Caliper Brake Pipe Fittings to Rear Wheel Cylinder Brake Pipe Fittings to Proportioning Valve Brake Pipe Fittings to Master Cylinder Master Cylinder Attaching Nuts Fluid Reservoir Screw Proportioning Valve Application

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Master Cylinder Application Pressure Ratio CutIn Pressure Bore Diameter Type

DAEWOO M-150 BL2

FASTENER TIGHTENING SPECIFICATIONS

GENERAL SPECIFICATIONS

SPECIFICATIONS

NSm

22 16 16 16 16 16 4

kPa (psi)

mm (in.)

Unit

MASTER CYLINDER 4B 9

Lb-Ft

16 12 12 12 12 12

3,000(435.1)

Description

20.64 (0.81)

0.25 : 30

Tandem

Lb-In

35