Brakes - Rear Drum Brake Noise

VOLUME
3

GROUP
Chassis

MODEL
Optima

NUMBER
009

DATE
April 2002

SUBJECT
Optima Rear Drum Brake Noise





This bulletin provides information relating to a change in Optima rear drum brakes to reduce operational noise. From 11/1/01 production, stiffeners were added to the brake shoes and a dust ring was added to the backing plate. These changes reduce incidence of rear brake squeal/squeak noise. These new parts may be used as a field fix for in-use complaint vehicles built before 11/1/01.

* NOTICE
For in-use complaint vehicles, both the backing plates and brake shoes must be replaced to be effective.

REPAIR PROCEDURE:

1. Raise and support vehicle on hoist.

2. Remove rear wheel.

3. Remove brake drum retaining screw and brake drum.

4. Remove brake shoes from backing plate.





5. Disconnect and cap brake hydraulic line.

* NOTICE
Make sure to cap open brake line. Too much fluid loss from master cylinder may cause difficulty when bleeding hydraulic system.





6. From behind backing plate, remove four bolts holding hub and bearing assembly to rear axle carrier and remove hub and bearing assembly.





7. Remove retaining clip securing parking brake cable casing to backing plate and remove backing plate from vehicle.

8. Transfer wheel cylinder to new backing plate, torque bolts to 9-13 lb-ft (12-18 Nm).

9. Install parking brake cable into new backing plate and reinstall cable casing retaining clip.

10. Position backing plate onto rear axle carrier.

11. Reinstall hub and bearing assembly and torque bolts to 52-66 lb-ft (70-90 Nm).

12. Reconnect brake hydraulic line.

13. Install new brake shoes onto backing plate.





14. Check the outside dimension of the shoes by turning auto adjuster to achieve 8.96-8.98 in. (227.6-228.1 mm).

15. Reinstall brake drum, drum retaining screw and wheel, torque wheel nuts to 66-81 lb-ft (90-110 Nm).

16. Repeat procedure for other rear side.

17. Bleed brake hydraulic system and adjust fluid level.





18. Lower vehicle and check parking brake adjustment; adjust if necessary to 4-5 clicks at 20 lb. of force.

* NOTICE
Parking brake adjustment is under center console storage box, storage box just pulls out.

19. Test drive vehicle.

AFFECTED PRODUCTION RANGE:

2001, 2002 MY Optima with rear drum brakes produced before 11/1/01.





PART NUMBER INFORMATION:





WARRANTY CLAIM INFORMATION: