Brakes - Rear Drum Brake Grabbing Issues
Bulletin No.: 04-007/09Last Issued: 07/29/2009
Subject:
GRABBING CONDITION FROM REAR DRUM BRAKES
BULLETIN NOTE
^ *This bulletin supersedes the previous bulletin 04-005/04 issued on 09/21/04 and 04-005/08 issued on 03/21/08. The APPLICABLE MODEL(S)/VINS and REPAIR PROCEDURE have been revised.
^ Changes are shown with asterisks and black lines*.
APPLICABLE MODEL(S)/VINS
*2002-2009 B-Series Trucks*
DESCRIPTION
Some vehicles may experience a grabbing condition from the rear drum brake assemblies during the first few brake applications. The condition only occurs after the vehicle has been parked for several hours. To reduce moisture intrusion into the rear brake drums, silicone is used to seal the brake backing plate.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
2. Raise and support vehicle and remove rear wheels.
3. Replace rear brake drum linings using MS3 online or Workshop Manual (section 04-11 REAR BRAKE DRUM REMOVAL / INSTALLATION).
* WARNING:
Do not breathe dust or use compressed air to blow dust from storage containers or friction components. Remove dust using government-approved techniques. Friction component dust may be a cancer and lung disease hazard. Exposure to potentially hazardous components may occur if dusts are created during repair of friction components, such as brake pads and clutch discs. Exposure may also cause irritation to skin, eyes and respiratory tract, and may cause allergic reactions and/or may lead to other chronic health effects. If irritation persists, seek medical attention or advice. Failure to follow these instructions may result in serious personal injury.*
4. Inspect the rear drum brake assemblies for damaged, missing and/or improperly seated adjuster plug (A) or parking brake cable. Replace any damaged or missing parts.
5. Inspect and clean rear brake drum surface. Machine if necessary.
6. Reinstall the rear brake drums and adjust the rear brakes according to MS3 online or Workshop Manual (section 04-11 REAR BRAKE DRUM REMOVAL / INSTALLATION).
7. Clean the backside of the backing plate using Brake Parts Cleaner (0000-77-620E-05) or equivalent for proper adhesion of silicone.
8. Apply Silicone (Permatex� Ultra Black� 82180) or equivalent to the backside of the rear drum brake backing plate at the following interface areas (B).
NOTE:
Avoid getting silicone on the brake bleed screw and brake tube nut.
9. Reinstall the rear wheels and torque lug nuts.
Tightening torque: 135 Nm (100 lb-ft)
10. Verify repair.
PART(S) INFORMATION
WARRANTY INFORMATION
NOTE:
^ This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair. Refer to the SRT microfiche for warranty term information. Warranty terms for this repair have been extended to 36 months from vehicle in-service date or 50,000 accrued miles which ever occurs first.
^ Additional diagnostic time and drum machining cannot be claimed for this repair.
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