CAMPAIGN:BRAKE BOOSTER VACUUM HOSE DETACHMENT. GMC Truck S15 Pickup - 2WD 1994

For 1990-2009 cars

# CAMPAIGN:BRAKE BOOSTER VACUUM HOSE DETACHMENT

#### SUBJECT: BRAKE BOOSTER VACUUM HOSE DETACHMENT

#### MODELS: 1994 GMC TRUCK S PICKUP WITH 2.2L ENGINE (RPO LN2)

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to adequately repair within 60 days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owner may be entitled to an identical or reasonably equivalent vehicle at no charge, or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule appointments with owners and to repair their vehicles as soon as possible. As you will see in reading the attached copy of the letter which is being sent to owners, the owner is being instructed to contact the GMC Truck Division Consumer Relations Office if the dealer does not remedy the condition within five days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed how to contact the National Highway Traffic Safety Administration.

#### DEFECT INVOLVED

General Motors has determined that a defect, which relates to motor vehicle safety, exists in CERTAIN 1994 S pickups with 2.2L engines (LN2). The vehicles may have the vacuum hose detach from the brake booster check valve as a result of engine backfire. This would result in increased engine idle and loss of brake power assist after depletion of the booster vacuum reserve: however, manual braking with increased pedal pressures would still be available. This detachment could occur with no warning to the driver and, if the booster vacuum reserve were depleted, the significant increase in brake pedal pressure experienced by the driver combined with the increased engine rpm when minimal stopping distances were required could result in a vehicle crash.

To correct this condition, dealers will install a clamp on the power brake booster hose at the brake booster check valve end.

#### VEHICLES INVOLVED

Involved are CERTAIN 1994 S/T pickups with 2.2L engines built within the following VIN breakpoints:

#### Year Model Plant From Through

1994 S/T pickups w/LN2 Linden SOP 1GTCS1448RK509121 1994 S/T pickups w/LN2 Shreveport SOP 1GTCS1449R8510713

The specific vehicles involved in this campaign have been identified by Vehicle Identification Number (VIN) Computer Listings. These listings are furnished to all involved dealers with the campaign. Dealers should confirm vehicle eligibility through VISS (Vehicle Information Service System) or SERVICENET prior to beginning campaign repairs.

#### DEALER CAMPAIGN RESPONSIBILITY

All unsold new vehicles in dealers' possession and subject to this campaign MUST be held and inspected/repaired per the SERVICE PROCEDURE of this campaign bulletin BEFORE owners take possession of these vehicles.

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.

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.

In summary, whenever a vehicle subject to this campaign enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.

If the name and address of the owner of an involved vehicle was unavailable to GMC Truck Division at the time of campaign initiation, the dealer must determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.

GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170

#### OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of owner letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing 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 this campaign.

#### SERVICE PROCEDURE

1. Remove the power brake booster hose from the power brake booster check valve.

2. Install clamp (P/N 12337891) on hose.

3. Reinstall the power brake booster hose on the power brake booster check valve.

4. Secure clamp.

5. Install campaign identification label as defined below.

#### PARTS INFORMATION

Parts are to be obtained from General Motors Service Parts Operation (GMSPO). To ensure that these parts will be obtained as soon as possible, they should be ordered from GMSPO on a C.I.O. order with no special instruction code but order under an advise code (2).

#### Part Number Description Quantity

12337891 Clamp 1

WARRANTY INFORMATION

Dealers should submit an accurately filled out Warranty Repair Order on each vehicle completed under this campaign.

Labor Description *Time Trouble Operation Allowance Code Number --------------------------------------------------------------------------- V9450 Install clamp, power brake booster hose 0.2 96

* For dealer to receive Administrative Time Allowance associated with this campaign, add 0. 1 hour to the Labor Operation Time Allowance.

#### CAMPAIGN IDENTIFICATION LABEL

Each vehicle corrected in accordance with the instructions outlined in this product campaign bulletin will require a "Campaign Identification Label." Each label provides a space to include the campaign number and five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ball point pen.

Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.

Apply "Campaign Identification Label" only on a clean, dry surface.

Dear GMC Truck Owner:

This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.

General Motors has determined that a defect, which relates to motor vehicle safety, exists in CERTAIN 1994 S pickups with 2.2L engines (LN2). The vehicles may have the vacuum hose detach from the brake booster check valve as a result of engine backfire. This would result in increased engine idle and loss of brake power assist after depletion of the booster vacuum reserve; however, manual braking with increased pedal pressures would still be available. This detachment could occur with no warning to the driver and, if the booster vacuum reserve were depleted, the significant increase in brake pedal pressure experienced by the driver combined with the increased engine rpm when minimal stopping distances were required could result in a vehicle crash.

To correct this condition, the dealer will install a clamp on the power brake booster hose. This service will be performed for you at no charge.

Instructions for performing this service have been sent to your GMC Truck dealer. Please contact your dealer to arrange a service date. The labor time necessary to perform this correction will be approximately 0.2 hours. Please ask your dealer how much additional time will be needed to process your vehicle.

Your GMC Truck dealer is best equipped to provide service to ensure your vehicle is corrected as promptly as possible. However, if you take your vehicle to your dealer on the agreed service date and they do not service this condition on that date or within five days, we recommend you contact GMC Truck Consumer Relations by telephone. Consumer Relations will assist you and your dealer in getting your vehicle corrected. The telephone number of the Consumer Relations office is listed in your Warranty and Owner Assistance Information Manual.

After contacting your dealer and GMC Truck Division, if you are still not satisfied that we have done our best to remedy this condition without charge within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 400 Seventh Street, S.W., Washington, D.C., 20590, or call 800-424-9393 (Washington, D.C. residents use 366-0123).

The enclosed postage paid owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please furnish us complete name and address of the person you sold or traded your vehicle to and return the card to us.

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

GMC TRUCK DIVISION GENERAL MOTORS CORPORATION

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.