Brakes - Rear Axle Grinding Noise, Replace Drum

Group Ref.: Drive Axle
Bulletin No.: 364301
Date: February, 1994

SUBJECT:
REAR AXLE GRINDING NOISE (REPLACE DRUM)

MODELS:
1994 CHEVROLET AND GMC SUBURBANS AND YUKONS/BLAZERS WITH 8.5 INCH REAR AXLES

CONDITION:

Some owners may comment on a grinding noise emanating at the rear of the vehicle while turning sharply to the left or to the right.

CAUSE:

An interference condition may exist on these models between the brake drum and the backing plate. Under some circumstances, this interference condition may result in a grinding noise. This condition was corrected in production in November of 1993.

Note:
Vehicles with axles manufactured after Julian Date 305 should not exhibit this condition. The Julian date can be found on the rear axle housing.

CORRECTION:

For vehicles exhibiting this condition, check for an interference condition between the backing plate and the drum on each rear wheel. Witness marks on the brake drum or backing plate may indicate that an interference condition exists. If an interference condition does exist, replace the subject brake drum following the procedure below.

SERVICE PROCEDURE:

1. Raise the vehicle and support with safety stands.

2. Remove the tire and wheel assembly.

3. Remove the drum.

4. Install a new drum.

5. Reinstall the wheel and tire assembly. Torque the nuts to 160 N.m (120 lbs. ft.)

SERVICE PARTS INFORMATION

P/N Description QTY

15693462 Brake Drum, Yukon/Blazer As Required

15693465 Brake Drum, 2-Wheel As Required
Drive Suburban

15693466 Brake Drum, 4-Wheel As Required
Drive Suburban

Parts are currently available from GMSPO.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

Labor Op Description Labor Time

H0200 Right Drum R&R Use Published
H0201 Left Drum R&R Labor Operation
H0207 Both Drums R&R Time