Defect Involved, Vehicles, Owner, Dealer and Parts Information

General Motors has determined that certain 1985 and 1986 Chevrolet C10 Light Duty Trucks were manufactured with improper size 11 x 2 inch rear brake assemblies, rather than the specified 11.15 x 2.75 inch brakes. These trucks fail to conform to the requirements of Federal Motor Vehicle Safety Standard (FMVSS) 105, "Hydraulic Brake Systems." Under certain conditions, the trucks might exceed the maximum stopping distance permitted by FMVSS 105. Should a minimum stopping distance be required while these trucks are being driven, a vehicle crash could occur without prior warning.
DEFECT INVOLVED

To correct this condition, the incorrect rear axle brake assemblies must be replaced with the proper size brake assemblies.


VEHICLES INVOLVED

Involved are twenty-three (23) 1985-86 Chevrolet C10 Light Duty Trucks equipped with 6.2L diesel engine (RPO LH6), 4-speed manual transmission (RPO MM4) and 3.42 ratio rear axle (RPO GU6) w/o locking rear axle (RPO G80) listed as follows:

1GCEC14C2FF352638 1GCEC14C0FF362102 1GCEC14C1FF375599 1GCEC14C3FF404584 1GCEC14C0FJ109178 1GCEC14C8FJ150769 1GCEC14C4FJ154026 1GCEC14CIFS125626 1GCEC14C1FS163079 1GCEC14C7FS165175 2GCEC14C9F1108122 2GCEC14C7F1140177 2GCEC14C8F1141208 2GCEC14C4F1167045 2GCEC14C3F1176898 2GCEC14C6F1187085 1GCEC14C3GJ104994 1GCEC14C6GS158610 1GCEC14C6GS165184 1GCEC14C4GS181724 1GCEC14C8GS182570 2GCEC14C7G1100487 2GCEC14C4G1125024

Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle Identification Number, owner name and address data, and are furnished to the involved dealers with the campaign bulletin. Owner name and address data furnished will enable dealers to follow-up with owners involved in this campaign.

These listings may contain owner names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.
OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of Owner Letter included with this bulletin).

DEALER CAMPAIGN RESPONSIBILITY

Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.

Whenever a vehicle subject to this campaign is taken into new or used vehicle inventory, or it is in your dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling 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 correction according to instructions contained in this bulletin.

This bulletin is notice to you that the new motor vehicles included in this campaign may not comply with the standard identified above. Under Section 108 of the National Traffic and Motor Vehicle Safety Act, it is illegal for a dealer to sell a new motor vehicle which the dealer knows does not comply with an applicable Federal Motor Vehicle Safety Standard. As a consequence, if you sell any of these motor vehicles without first performing the campaign correction, your dealership may be subject to a civil penalty up to $1,000 for each such sale.

PARTS INFORMATION

The parts kits required for this campaign have been limited just to those
vehicles involved. They have also been made available on a one time only
basis. Therefore, dealers must contact their Branch office to order
parts. This should only be done, however, when contacted by an involved
owner. The Branch will then contact Central Office and parts will be


shipped directly to the involved dealer.


Parts are not to be ordered from or returned to General Motors Service Parts Operations (GMSPO).

Parts will be shipped in two boxes, one right hand and one left hand.

Parts will consist of

1. Brake assembly including backing plate, shoes, wheel cylinder, valve, lever pin, screw and parking brake cable.

2. Flange attaching bolts, nuts and washers.

3. Drums.

4. Cover pan gasket.

5. Installation instructions.
PARTS INFORMATION

Procure locally:

QUANTITY DESCRIPTION PART NUMBER

4 pints SAE80W OR 80W-90GLS 1051855
gear lubricant

As required brake fluid - Delco 1052535
Supreme or DOT-3 equivalent