GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1990 🢒 Astro - 4WD 🢒 Bulletins 🢒 CAMPAIGN: COMPOSITE BRAKE ROTOR CORROSION (CANADA ONLY)

CAMPAIGN: COMPOSITE BRAKE ROTOR CORROSION (CANADA ONLY)

SUBJECT: COMPOSITE BRAKE ROTOR CORROSION - CANADA ONLY

Models: Certain 1988-1992 GMC & Chevrolet 'K1', 'K2' Trucks and 1990-1991 GMC & Chevrolet 'L' Vans

MARITIME PROVINCES ONLY

TO: ALL GENERAL MOTORS DEALERS

General Motors of Canada Limited has determined that a defect which relates to motor vehicle safety exists in certain 1988-1992 GMC & Chevrolet 'K1', 'K2' Trucks and 1990-1991 GMC & Chevrolet 'L' Vans used in the Canadian Maritime Provinces. These trucks have composite front brake rotors. If severe crevice corrosion were present, the stamped-steel centre section of the composite front brake rotor could separate from the cast outer rotor resulting in a total loss of braking capability for the affected wheel. Partial loss of front braking at a time when minimum stopping distance is required could result in a vehicle crash without prior warning.

To prevent this condition from occurring, dealers are to replace both front brake rotors with rotors having a corrosion protective coating. Replacement of the brake linings is considered a normal maintenance item. Due to normal wear, it is possible that the brake linings will need to be replaced. Replacement of the brake linings, if necessary, should be done at the owner's expense.

VEHICLES INVOLVED:

Involved are certain 1988-1992 GMC & Chevrolet 'K1', 'K2' Trucks and 1990-1991 GMC & Chevrolet 'L' Vans which operate in the Canadian Maritime Provinces.

Plant Year Model Plant Code From Through ---- ----- ----- ---- ---- ------- 1988 CHEV/GMC /K 1-2 Oshawa 1 SOP EOP 1988 CHEV/GMC /K 1-2 Pontiac East E SOP EOP 1988 CHEV/GMC /K 1-2 Fort Wayne Z SOP EOP 1989 CHEV/GMC /K 1-2 Oshawa 1 SOP EOP 1989 CHEV/GMC /K 1-2 Pontiac East E SOP EOP 1989 CHEV/GMC /K 1-2 Fort Wayne Z SOP EOP

1990 CHEV/GMC /K 1-2 Oshawa 1 SOP EOP 1990 CHEV/GMC /K 1-2 Pontiac East E SOP EOP 1990 CHEV/GMC /K 1-2 Fort Wayne Z SOP EOP

1991 CHEV/GMC /K 1-2 Oshawa 1 SOP EOP 1991 CHEV/GMC /K 1-2 Pontiac East E SOP EOP 1991 CHEV/GMC /K 1-2 Fort Wayne Z SOP EOP

1990 GMC /L VAN Oshawa 1 SOP N1504216 1990 CHEV /L VAN Oshawa 1 SOP N1111822 1990 GMC /L VAN Pontiac East E SOP NE505728 1990 CHEV /L VAN Pontiac East E SOP NE114342 1990 GMC /L VAN Fort Wayne Z SOP NZ502681 1990 CHEV /L VAN Fort Wayne Z SOP NZ110576

1991 GMC /L VAN Oshawa 1 SOP N1504216 1991 CHEV /L VAN Oshawa 1 SOP N1111822 1991 GMC /L VAN Pontiac East E SOP NE505728 1991 CHEV /L VAN Pontiac East E SOP NE114342 1991 GMC /L VAN Fort Wayne Z SOP NZ502681 1991 CHEV /L VAN Fort Wayne Z SOP NZ110576

All affected vehicles have been identified by the VIN listing provided to involved dealers with this bulletin. Any dealer not receiving a listing was not shipped any of the affected vehicles.

DEALER CAMPAIGN RESPONSIBILITY:

Dealers are to perform this campaign on all involved vehicles at no charge to owners, regardless of kilometres traveled, age of vehicle, or ownership, from this time forward.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service, you are to ensure the campaign correction has been made before selling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.

CAMPAIGN PROCEDURE:

Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.

OWNER NOTIFICATION:

All owners of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors. The listings provided are for campaign activity only and should not be used for any other purpose.

PARTS INFORMATION:

Parts required to complete this campaign should be ordered through regular channels, as follows:

Part Number Description Quantity/Vehicle

15679710 Front Wheel Disc for 1988-1992 K1 2 with Heavy Duty Front Suspension (RPO F44) and K2

15679744 Front Wheel Disc for 1988-1991 K1 2 without Heavy Duty Front Suspension (RPO F44)

15679711 Front Wheel Disc for 1990-1991 L1 Van 2

PARTS AND LABOUR CLAIM INFORMATION:

Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card or DCS transmission in accordance with the following:

Repair Code Description Time Allowance ----------- ----------- -------------- 2A Replace Rotor, Both Front . 6

Time allowance includes 0. 1 hour for dealer administrative detail associated with this campaign. Repair Code 2A includes $2.52 for 500 ml brake fluid (Pt. No. 992669) Parts credit will be based on dealer net plus 30% to cover parts handling.

SERVICE PROCEDURE:

1. Raise the vehicle.

2. Remove both front wheels.

3. Drain 2/3 of the brake fluid from the master cylinder.

4. Remove and support both front brake calipers.

5. Remove both front brake rotors.

6. Install new front rotors.

7. Reinstall both front calipers.

8. Refill the master cylinder with new brake fluid.

9. Reinstall the front wheels.

10. Lower the vehicle.

11. Install "Campaign Identification Label."

*Note: Due to normal wear, it is possible that the brake linings will need to be replaced. Replacement of the brake linings, if necessary, should be done at the owner's expense.

INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL

Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.

Dear General Motors Customer:

General Motors of Canada Limited has determined that a defect which relates to motor vehicle safety exists in certain 1988-1992 GMC & Chevrolet 'K1', 'K2' Trucks and 1990-1991 GMC & Chevrolet 'L' Vans used in the Canadian Maritime Provinces. These trucks have composite front brake rotors. Due to severe crevice corrosion, the stamped-steel centre section of the composite front brake rotor could separate from the cast outer rotor resulting in a total loss of braking capability for the affected wheel. Partial loss of front braking at a time when minimum stopping distance is required could result in a vehicle crash without prior warning.

To prevent this condition from occurring, dealers are to replace both front brake rotors with rotors having a corrosion protective coating. Replacement of the brake linings is considered a normal maintenance item. Due to normal wear, it is possible that the brake linings will need to be replaced. If replacement of the brake linings is necessary, it will be done at your expense.

Please contact your GM dealer as soon as possible to arrange a service date.

If parts are required, ask your dealer for details regarding their availability. If parts are not in stock, they can be ordered before scheduling your service date.

This letter identifies your vehicle. Presentation of this letter to your dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.

Subsequent to contacting your dealer, further assistance, if required, may be obtained from our Customer Assistance Centre, toll free, by calling 1-800-263-3777 (English), or 1-800-263-7854 (French).

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.

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.