M34e Rear Drum Brakes.pdf part of Daewoo Matiz 796cc (My 2003).part01.rar, Service Manual, Wiring Diagram - 16 Part File

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SECTION 4E

REAR DRUM BRAKES
TABLE OF CONTENTS
Description and Operation . . . . . . . . . . . . . . . . . . Drum Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Component Locator . . . . . . . . . . . . . . . . . . . . . . . . Rear Drum Brakes . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Information and Procedures . . . . . Rear Drum Brake . . . . . . . . . . . . . . . . . . . . . . . . . . Drums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4E-2 4E-2 4E-3 4E-3 4E-4 4E-4 4E-5 4E-5 Rear Brake Drum . . . . . . . . . . . . . . . . . . . . . . . . . . Brake Shoe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wheel Cylinder Assembly . . . . . . . . . . . . . . . . . . Backing Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unit Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wheel Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Specifications . . . . . . . . . . . . . . . . . . . . 4E-6 4E-7 4E-8 4E-9

4E-10 4E-10 4E-11 4E-11

Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 4E-6 On-Vehicle Service . . . . . . . . . . . . . . . . . . . . . . . . . . 4E-6

Fastener Tightening Specifications . . . . . . . . . . 4E-11

DAEWOO M-150 BL2

4E ґ 2 REAR DRUM BRAKES

DESCRIPTION AND OPERATION
DRUM BRAKES
This drum brake assembly is a leading/trailing shoe design. Both brake shoes are held against the wheel cylinder pistons by the lower return spring and the fixed anchor plate near the lower return spring. When the brakes are applied, the wheel cylinder pistons move both shoes out to contact the drum. With forward wheel rotation, the forward brake shoe will wrap into the drum and become self-energized. With reverse wheel rotation, the rear brake shoe is self-energized. Force from the brake shoes is transferred to the anchor plate through the backing plate to the axle flange. Adjustment is automatic and occurs on any service brake application. Do not switch the position of shoes that have been in service, as this may render the self-adjustment feature inoperative and result in increased pedal travel. Notice: D Replace all the components included in the repair kits used to service this drum brake. D Do not use lubricated shop air on the brake parts, as damage to the rubber components may result. D If any hydraulic component is removed or disconnected, it may be necessary to bleed all or part of the braking system. D The torque values specified are for dry, unlubricated fasteners. D Perform service operations on a clean bench that is free from all mineral oil materials.

DAEWOO M-150 BL2

REAR DRUM BRAKES 4E ґ 3

COMPONENT LOCATOR
REAR DRUM BRAKES

D107C401

1. 2. 3. 4. 5. 6. 7. 8.

Bleeder Screw Bleeder Screw Rear Brake Assembly Rear Brake Plate Wheel Cylinder Strut Assembly Brake Leading Shoe Middle Return Spring

9. 10. 11. 12. 13. 14. 15. 16.

Upper Return Spring Brake Shoe Retain Spring Pin Trailing Shoe Brake Shoe Retain Spring Brake Shoe Retain Spring Cap Lower Return Spring Hub Bolt Rear Brake Drum

DAEWOO M-150 BL2

4E ґ 4 REAR DRUM BRAKES

DIAGNOSTIC INFORMATION AND PROCEDURES
REAR DRUM BRAKE

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Condition Probable cause Correction Not Enough Braking Force D Badly worn brake shoe lining. D Lining stained with oil. D Replace the lining. D Check the wheel cylinder leaks and then replace the wheel cylinder or the lining, if needed. D Replace the wheel cylinder. D Repair the selfґadjustment feature. D Check the wheel cylinder leaks and then replace the wheel cylinder or the lining, if needed. D Replace the wheel cylinder. D Repair the selfґadjustment feature. D Replace the brake shoe return spring. D Replace the wheel cylinder. D Replace the lining. D Repair the selfґadjustment feature. D Clean the rear drum brake. D Tighten the brake plate bolt. D Replace the drum. D Check the wheel cylinder leaks and then replace the wheel cylinder or the lining, if needed. D Repair the selfґadjustment feature. D Adjust the parking brake cable. D Wheel cylinder condition faulty. D Malfunctioning selfґadjustment feature. Uneven Braking D Lining stained with oil. D Wheel cylinder condition faulty. D Malfunctioning selfґadjustment feature. Dragging Brakes After Pedal is Released D Weakened brake shoe return spring. D Wheel cylinder condition faulty. Excessive Pedal Travel D Excessively worn lining. D Malfunctioning selfґadjustment feature. Braking Noise or Vibration D Foreign material stuck to drum. D Loosen brake plate bolt. D Damaged drum. Poor Braking Force of Parking Brake D Lining stained with oil. D Damaged selfґadjustment feature. D Poor adjustment of parking brake cable.
DAEWOO M-150 BL2

REAR DRUM BRAKES 4E ґ 5

DRUMS
Inspect the brake drum as follows ; 1. Inspect the drum for crack or damage. 2. Measure the inside diameter. Unit : mm (in.) Inside Diameter Wear Limit Value 182 (7.165)

LINING
Inspect the brake drum as follows ; 1. Inspect the lining for wear or stain with oil. 2. Measure the thickness. Unit : mm (in.) Lining Wear Limit Value 1 (0.039)

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D107C301 D107C302

3. If the measured value is over the limit value, or if the defect is found, replace the drum.

3. If the measured value is within the limit value, or if the defect is found, replace the lining.

DAEWOO M-150 BL2

4E ґ 6 REAR DRUM BRAKES

REPAIR INSTRUCTIONS ONґVEHICLE SERVICE
REAR BRAKE DRUM
Removal Procedure
1. Remove the rear wheels. Refer to Section 6E, Tires and Wheels. 2. Release the parking brake. 3. Remove the brake drum. D D D D
D107C501

Remove the spindle cap (1). Remove the cotter pin and do not reuse it (2). Remove the castellated nut (3). Remove the rear axle washer (4).

D Remove the bearing, race and oil seal. Refer to Section 2D, Rear Suspension. D Remove the hub bolts using a hammer (5). Important: Do not reuse removed hub bolts.

D17C502A

Installation Procedure
1. Install the brake drum. D Insert the new hub bolts using a hammer. D Install the bearing, race, oil seal and rear axle washer.

D107C503

DAEWOO M-150 BL2

REAR DRUM BRAKES 4E ґ 7
D D D D Tighten the castellated nut to 25 NSm (18 lb-ft). Loosen the castellated nut to 180_. Retighten the castellated nut to 2.5 NSm (22 lb-in). Install the new cotter pin and spindle cap.

2. Adjust the parking brake. 3. Install the rear wheels. Refer to Section 6E, Tires and Wheels.

D17C504A

BRAKE SHOE
Removal Procedure
1. Remove the brake drum. Refer to "Brake Drum" in this section. 2. Remove the return spring. D Remove the upper return spring (1). D Remove the upper return spring bracket (2). D Remove the lower return spring (3).

D107C505

D Remove the adjust lever (4). D Remove the middle return spring (5).

D107C506

3. Remove the brake shoe. D Remove the readjusting unit (1). D Turn the brake shoe retaining spring pin rectangularly by the pliers (2). D Remove the brake shoe retain spring cap (3). D Remove the retaining spring (4). D Remove the retaining spring pin (5). D Remove the leading shoe (6).

D107C507

DAEWOO M-150 BL2

4E ґ 8 REAR DRUM BRAKES
4. Disconnect the parking brake cable from the trailing shoe and remove the trailing shoe (7).

D107C508

Installation Procedure
1. Install in the reverse of removal. 2. Clean the adjust assembly and apply grease. 3. Connect the parking brake cable from the trailing shoe. 4. Install the brake shoe. 5. Install the return spring. D Install the middle return spring and adjust lever. D Install the lower return spring. D Install the upper return spring bracket. D Install the upper return spring. 6. Install the brake drum. Refer to "Brake Drum" in this section.

D107C509

WHEEL CYLINDER ASSEMBLY
Removal Procedure
1. Remove the brake drum. Refer to "Rear Brake Drum" in this section. 2. Remove the wheel cylinder. D Remove the brake shoe upper spring (1). D Widen the leading shoe and trailing shoe (2).

D107C510

D Disconnect the brake line fitting (3). D Plug the opening in the brake line to prevent fluid loss or contamination. D Remove the wheel cylinderґtoґbacking plate bolt (4).

D107C511

DAEWOO M-150 BL2

REAR DRUM BRAKES 4E ґ 9 Installation Procedure
1. Install the wheel cylinder to the backing plate with the wheel cylinder bolt (1).

Tighten
Tighten the wheel cylinderґtoґbacking plate bolt to 10 NSm (89 lb-in). 2. Connect the brake line fitting (2).

Tighten
Tighten the brake line fitting to 16 NSm (12 lb-ft). 3. Install the brake shoe. Refer to "Brake Shoe" in this section. 4. Install the brake drum. Refer to "Rear Brake Drum" in this section.

D17C512A

BACKING PLATE
Removal Procedure
1. Remove the brake drum. Refer to "Rear Brake Drum" in this section. 2. Remove the brake shoe components. Refer to "Brake Shoe" in this section. 3. Remove the wheel cylinder assembly. Refer to "Wheel Cylinder Assembly" in this section. 4. Remove the bolts and the backing plate.

D107C513

Installation Procedure
1. Install the bolts and the backing plate.

Tighten
Tighten the backing plateґtoґrear axle bolts to 24 NSm (18 lb-ft). 2. Install the wheel cylinder assembly. Refer to "Wheel Cylinder Assembly" in this section. 3. Install the brake shoe components. Refer to "Brake Shoe" in this section. 4. Install the brake drum.
D17C514A

DAEWOO M-150 BL2

4E ґ 10 REAR DRUM BRAKES

UNIT REPAIR
WHEEL CYLINDER
Disassembly Procedure
1. Remove the wheel cylinder assembly. Refer to "Wheel Cylinder Assembly" in this section. 2. Disassemble wheel cylinder assembly. D Remove the dust boots and do not reuse them (1). D Remove the piston (2). D Remove the piston cup and do not reuse it (3). D Remove the spring assembly (4). D Remove the bleeder screw (5). 3. Clean all parts with denatured alcohol. Dry the parts with unlubricated compressed air.

D107C701

Assembly Procedure
Important: Lubricate the new seals, the piston, the piston cup and the wheel cylinder bore with clean brake fluid before assembly. 1. Assemble wheel cylinder assembly. D Insert the bleeder screw.

Tighten
Tighten the bleeder screw to 6 NSm (53 lb-in). D Install the spring and the new piston cup.
D17C702A

D Install the piston and the new boots. 2. Inspect the piston for free movement. 3. Install the wheel cylinder assembly. Refer to "Wheel Cylinder Assembly" in this section.

DAEWOO M-150 BL2

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Q Castellated Nut : 25 NSm ґ 180_ + 2.5 NSm (18 lb-ft ґ 180_ + 22 lb-in.) Bleeder Screw Brake Pipe Fitting Brake Backing Plate Bolt Wheel Cylinder Bolt Castellated Nut* Wheel Cylinder Application Inside Diameter

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Brake Lining Drum Distance Between Lining and Drum Wear Limit Thickness Cylindricty Out of Round Wear Limit Inside Diameter Application

DAEWOO M-150 BL2

FASTENER TIGHTENING SPECIFICATIONS

GENERAL SPECIFICATIONS

SPECIFICATIONS

NSm

mm (in.)

mm (in.)

mm (in.)

mm (in.)

mm (in.)

mm (in.)

mm (in.)

mm (in.)

16 24 10 ґ

6

Unit

REAR DRUM BRAKES 4E ґ 11

Lb-Ft

12 18 ґ ґ

ґ

17.46 (0.687)

0.02 (0.0008)

Description

0.04 (0.001)

182 (7.165)

180 (7.086)

0.3 (0.011)

1 (0.039)

4 (0.157)

Lb-In

53 89 ґ ґ ґ