INTERFER. BTWN FRNT BRK ANCHOR PLATES & STEERING KNUCKLE
Subject: INTERFERENCE BETWEEN THE FRONT BRAKE ANCHOR PLATES AND THE STEERING KNUCKLE
Models: 1991-92 C7H TopKick Models with Hydraulic Brakes (JE3) and 11000/12000 lb (500015455 kg) Front Axles (FL2/FS7)
TO: ALL GENERAL MOTORS DEALERS:
General Motors of Canada Limited has determined that certain 1991-92 C7H TopKick models equipped with hydraulic brakes (JE3) and 11000/12000 lb (5000/5455 kg) front axles (FL2/FS7) may have been built with an interference condition between one or both of the front brake anchor plates and the steering knuckle. The interference condition could result in some loss of torque on the mounting bolts, but with no loss of function.
To correct this condition, dealers with inspect both front brake anchors for an interference condition and replace as required.
VEHICLES INVOLVED:
Involved are certain 1991-92 C7H TopKick models equipped with hydraulic brakes (JE3) and 11000/12000 lb (5000/5455 kg) front axles (FL2/FS7) and built within the following VIN breakpoints:
Model Year Model From Through
1991 TopKick M1517149 MJ523062
1992 TopKick NJ500011 NJ502039
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 (see copy of owner letter included with this bulletin). 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 ----------- ----------- ----------------
15673235 Left-Hand Anchor Plate 1
15673236 Right-Hand Anchor Plate 1
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 ------------ ----------- --------------
1A Inspect Both Anchor Plates 0.3
2A Inspect Both Anchor Plates 1.2 and Replace One Anchor Plate
3A Inspect Both Anchor Plates 2.1 and Replace Both Anchor Plates
Time allowance includes 0. 1 hour for dealer administrative detail associated with this campaign. Parts credit will be based on dealer net plus 30% to cover parts handling.
SERVICE PROCEDURE:
A. Inspection
1. Prepare the vehicle by engaging the parking brake and blocking all the wheels. The front wheels should be in the straight position.
2. Check the front brake anchor plate for scalloping as illustrated in Figure 1. The correct anchor plate will allow insertion of a 1/8 in. drill bit or a similar test instrument between the anchor plate and the steering knuckle. The incorrect anchor plate is unscalloped (Figure 2).
3. Repeat the inspection for the opposite side front anchor plate.
4. If both anchor plates are found to be correct, install the "Campaign Identification Label." If one or both anchor plates are found to be incorrect, continue on to Part B.
B. Replacement Procedure
1. Replace the anchor plate(s) following the Anchor Plate Replacement Procedure found in the 1991 Medium Duty Service Manual (X-9133 Page 5A2-12) or the 1992 Medium Duty Service Manual (X-9233 Page 5A2-11).
2. Install the "Campaign Identification Label."
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.
General Motors of Canada bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer." They are written to inform these 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 your General Motors dealer for information on whether your vehicle may benefit from the information.
Dear General Motors Customer
General Motors of Canada Limited has determined that certain 1991-92 C7H TopKick models equipped with hydraulic brakes (JE3) and 11000/12000 lb (5000/5455 kg) front axles (FL2/FS7) may have been built with an interference condition between one or both of the front brake anchor plates and the steering knuckle. The interference condition could result in some loss of torque on the mounting bolts, but with no loss of function.
To correct this condition, dealers will inspect both front brake anchors for an interference condition and replace as required.
This service will be provided for you at no charge.
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.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
Customer Support Department General Motors of Canada Limited
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.
