BRAKE LEAD/PULL & FRONT BRAKE WEAR TSB #86-50-20

Subject: Brake Lead/Pull and Front Brake Wear Bulletin No.: 86-50-20
Date: April, 1998
Subject: Brake Lead/Pull and Front Brake Wear (Replace Rear Brake Shoes)
Models: 1992-98 Chevrolet and GMC C/K Truck and Suburban Models with 8600GVW (RP0C6P)
1996-98 Chevrolet and GMC G Vans with power brakes RPO JB8

Condition: Some owners may comment about the vehicle leading or pulling to either side while applying the brakes or front brake wear not meeting expetations, especially vehicles that have been used to tow a heavy load.

Cause: Conditions may be caused by excessive wearing of the font brake material. Improvements to the above conditions can be gained through rear brake material modifications. On Suburban models, the best performance from this new brake material can be achieved with replacing the proportioning valve.

Correction: Replace the rear brake shoes with Dura Stop brake shoe kit. On Suburban models (C/K 20906), a proportioning valve must be installed. All other models (C/K, G), no proportioning valve change is required. Use the part numbers listed. Refer to Section 5C2 of the Service Manual.

Parts Information
PN 18029651, Description Shoe Kit, Durastop, Quantity 1
PN 15650150, Description Valve Asm., Brake Comb., Quantity 1 (92-94 Suburbans)
PN 12548265 Description Valve Kit, Brake Comb., Quantity 1 (95 and Newwer Suburbans)

Parts are currently available from GMXPO

Warranty Information
Labor Operation H0257, Shoes and Linings, Drum Brakes--R&R or Replace
Labor operation H0775, Valve Height Sensing Brake Proportioner, Replace

Important: Labor operation is coded to base vehicle coverage in the warranty system.

Harold