FRONT DISC BRAKE SQUEAKS/SQUEALS. Chevrolet Chevy G Van 1992

REVISION: 11/13/95

THIS BULLETIN IS BEING REVISED TO INFORM GM OF CANADA DEALERS THAT DIFFERENT PART NUMBERS ARE APPLICABLE FOR CANADA. **********************************************************************

SUBJECT: FRONT DISC BRAKE SQUEAKS/SQUEALS (INSTALL NEW FRONT DISC PAD)

MODELS: 1990-95 CHEVROLET G VANS BUILT BEFORE VIN SF156737 1990-95 GMC TRUCK G VANS BUILT BEFORE VIN SF522888 WITH RPO'S JB5 OR JB7 BRAKES

CONDITION:

SOME CUSTOMERS MAY EXPERIENCE A HIGH PITCHED SQUEAK/SQUEAL COMING FROM THE FRONT DISC PADS UNDER LIGHT OR MODERATE BRAKE APPLICATIONS.

CAUSE:

THE ABOVE CHARACTERISTIC IS COMMONLY DUE TO COMPONENT SENSITIVITY TO MOISTURE AND CONTAMINATES.

CORRECTION:

A REVISED FRONT DISC PAD WITH A NEW INSULATOR MATERIAL DM7642 (WOLVERINE) HAS BEEN RELEASED. THE NEW INSULATOR IS PERMANENTLY ATTACHED TO THE METAL PORTION OPPOSITE SIDE OF THE BRAKE PAD.

IT IS IMPORTANT TO UNDERSTAND THAT THE NEW MATERIAL MAY NOT TOTALLY ELIMINATE BRAKE NOISE. IT MAY HOWEVER REDUCE THE NOISES TO A LEVEL WHICH IS MORE ACCEPTABLE.

BECAUSE OF STRICT DESIGN REQUIREMENTS, THE DISC BRAKE PADS ON VEHICLES USED TODAY CONSIST OF A SERMETALLIC-RESIN MIXTURE WHICH MAY CAUSE AN OCCASIONAL OR INTERMITTENT HIGH PITCHED SQUEAK/SQUEAL WHEN BRAKES ARE LIGHT OR MODERATELY APPLIED. SOME BRAKE NOISE MAY BE CHARACTERISTIC. IF THE DEALER SERVICE DEPARTMENT HAS DEMONSTRATED THAT THE CONDITION IS A NORMAL CHARACTERISTIC, THE CUSTOMER SHOULD BE ASSURED THAT THIS IS NORMAL AND NO REPAIRS SHOULD BE ATTEMPTED.

SERVICE PROCEDURE

REFERENCE THE SERVICE MANUAL SECTION 5B1 FOR PROPER REPLACEMENT PROCEDURES.

NOTICE: IF THE BRAKE ROTORS NEED TO BE REFINISHED, FOLLOW THE PROCEDURES LOCATED IN THE SERVICE MANUAL REFERENCE SECTION 5B1.

PARTS INFORMATION

P/N DESCRIPTION QTY 12370017 FRONT DISC PADS (JB5)-NON-CANADIAN DEALERS 2 18023789 FRONT DISC PADS (JB5)-CANADIAN DEALERS ONLY 2 12370019 FRONT DISC PADS (JB7)-NON-CANADIAN DEALERS 2 18022112 FRONT DISC PADS (JB7)-CANADIAN DEALERS ONLY 2

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: H0042 USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 0

CAPTIONS: 0

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.