CAMPAIGN: PARK BRAKE LEVER ASSEMBLY (REPLACE LEVER ASSY.)

Subject: PARKING BRAKE LEVER ASSEMBLY

Models/Years: CERTAIN 1991 NINETY EIGHT AND 1992 EIGHTY EIGHT MODELS

CONDITION

General Motors has determined that certain 1991 Oldsmobile Ninety Eight and 1992 Oldsmobile Eighty Eight model vehicles fail to conform to Federal Motor Vehicle Safety Standard 105, "Hydraulic Brake Systems", which, in part, covers parking brake performance. Some of these vehicles have parking brake lever assemblies which when applied can release one or more teeth. If release occurs, the cable load applying the rear brakes will be reduced, and depending upon the extent of lever release, the parking brake may not hold the vehicle as required.

To prevent this condition from occurring, dealers are to inspect, and, if required, replace the parking brake lever assembly.

VEHICLES INVOLVED

Involved are certain 1991 Oldsmobile Ninety Eight and 1992 Oldsmobile Eighty Eight model vehicles equipped with Parking Brake Lever Assemblies with date codes A1091, Al 121, Al 221, Al 231, Al 261, Al 271, A1281, A1291, and A1301, within the following VIN breakpoints:

Through & Year Model Model Name Plant Beginning Including ---- ----- ------------ ----- --------- ----------- 1991 C Ninety Eight Orion M4336852 M4340347

1992 H Eighty Eight Flint NH300107 NH305101

1992 H Eighty Eight Wentzville N1800014 N1800026

NOTE: Some of the subject vehicles within the breakpoints listed above were corrected at the assembly plants prior to being shipped to dealers and will not require inspection by the dealer. All subject vehicles which are listed on the dealer's campaign printout will require inspection, and, if necessary, replacement of the Parking Brake Lever Assembly as outlined in the SERVICE PROCEDURE section of this bulletin. If there is a question regarding the campaign involvement of a vehicle within the above breakpoints which is not listed on the dealer's printout, please inquire to the Vehicle Information Service System (VISS).

NOTE: There are an estimated 7941 vehicles involved within the VIN ranges above. It is expected that about half of these will require replacement of the Parking Brake Lever Assembly.

DEALER ACTION

Dealers are to perform this campaign on all vehicles involved 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 your new or used vehicle inventory, or it is in your dealership for service, dealers are to ensure the campaign correction has been made before selling or releasing the vehicle.

Dealers are to contact owners of vehicles recently sold from your new or used vehicle inventory and arrange for the campaign correction to be performed.

SERVICE PROCEDURE

Inspection:

1. Using a flashlight, inspect the parking brake lever assembly for suspect date codes A1091, A1121, A1221, A1231, A1261, A1271, A1281, A1291, or A1301. These date codes are stamped into the inboard side of the parking brake pedal assembly approximately three (3) inches above the pedal pad (see Figure 1).

If one of the suspect date codes listed above is found, proceed to Replacement. If the date code can not be easily identified, also proceed to Replacement.

If the date code is not one of those listed above, proceed to step 22 of Parking Brake Cable Adjustment.

Replacement:

1. Loosen parking brake cable under the vehicle.

2. Write down the owner's preset memory settings which will be lost when the battery is disconnected for reference later when resetting the memory functions. If a memory retention device is plugged into the cigarette lighter socket (such as "Memor-Eze", Snap-On Tool YA960, or Kent-Moore Tools KS295A or BT 9027), this step can be omitted. With the ignition in the "off" position, disconnect the negative battery cable from the battery.

3. Remove left lower I/P sound insulation.

4. Disable the Inflatable Restraint System (SIR). Refer to SUPPLEMENTAL INFLATABLE RESTRAINT, page 9J-A-3 of the 1991 Ninety Eight or 1992 Eighty Eight Service Manual. Disconnect the SIR inflator module circuit by disconnecting the YELLOW connector at the base of the steering column. Failure to disconnect the yellow connector may result in airbag deployment with personal injury.

5. Remove fuse block cover, set aside fuse block and light control module (if equipped).

6. Disconnect release handle cable (8) from lever assembly (1). See Figure 3, view A.

7. Disconnect parking brake cable (5) from lever assembly (see Figure 3, view D) after removing retaining clip (6), if so equipped.

8. Disconnect electrical connector (9) from parking brake switch (i 0). See Figure 3, view C.

9. Remove lever assembly attaching nuts (2 & 4). See Figure 3.

10. Remove parking brake lever assembly.

11. Transfer switch (i 0) and plastic shield (if so equipped) to new parking brake lever assembly.

12. Reverse steps 5 through 1 0 to install new lever assembly.

CAUTION:

Parking brake cable and lever assembly are to be routed left of the transaxle shift cable. Do not place brake cable or lever assembly over shift cable. Torque two nuts at upper rear locations (2) and nut at lower front location (4) to 18 N.m (1 3 lb.ft.).

13. Enable the SIR system. Refer to SUPPLEMENTAL INFLATABLE RESTRAINT, page 9J-A-3 of the 1991 Ninety Eight or 1992 Eighty Eight Service Manual. Reconnect the SIR inflator module circuit by connecting the YELLOW connector at the base of the steering column.

14. Reinstall left lower I/P sound insulator.

15. With the ignition in the off position, reconnect the negative battery cable. If a memory retention device was not used, please reset (to the extent possible) all devices that lost their memory after the battery was disconnected.

Parking Brake Cable A

1. Raise vehicle and suitably support (Refer to Service Manual section OA).

2. Mark relationship of rear wheel to wheel studs in bearing flange.

3. Remove rear wheel and tire assemblies.

4. Mark relationship of rear drum to wheel studs in bearing flange.

5. Remove brake drums.

6. Make sure the lever stops (i 6, Figure 4) on both park brake levers (I 2) are against edges of shoe webs on park brake shoes (11). If park brake cable is holding stops off the edge of the show web, loosen the park brake cable adjustment.

7. Measure the inside diameter (ID) of the drum using J 21177-A or J22364-01.

8. Turning the star wheel on the adjusting screw assembly (15), adjust the shoe and lining diameter to be 1.27 mm (0.050 in.) less than inside drum diameter for each rear wheel.

9. Install drums, wheel and tire assemblies, aligning marks made at removal. Install wheel nuts finger tight.

10. Lower Vehicle.

11. Using a star pattern, torque wheel nuts to 140 N. m (100 lb. ft.).

12. Apply and release service brake pedal 30 to 35 times with normal pedal force. Pause about one (1) second between pedal applies.

13. Apply and release parking brake five (5) times to ten (10) clicks.

14. Check parking brake pedal for full release by turning ignition to "ON" and checking the "BRAKE" indicator light. The light should be off. If the light is on and the brake appears to be released, operate pedal release lever and pull downward on the front parking brake cable to remove slack.

15. Apply park brake to four clicks.

16. Raise vehicle and suitably support.

17. Remove access hole plug in rear brake backing plates.

18. Adjust parking brake cable until a 1/8-inch drill bit can be inserted through access hole in space between shoe web (11) and park brake lever (12). Refer to Figure 2. Satisfactory cable adjustment is achieved when a 1/8-inch drill bit will fit into the space, but a 1/4-inch drill bit will not.

19. Release park brake and check for free wheel rotation.

20. Reinstall access hole plugs.

21. Lower vehicle.

22. Install a Campaign Identification Label. Each label provides space to print the campaign number, and the five (5) digit dealer code of the dealer performing the campaign. Insert this information with a typewriter or ballpoint pen. When installing label, clean and dry the surface of the radiator support tie bar and apply the campaign label where it is readily visible.

PARTS INFORMATION

To ensure parts are obtained as soon as possible, order them from GM Service Parts Operations (GMSPO) on a C.I.O. order, with NO special instruction code, but order on an Advise Code (2). Use the following part numbers:

Description Part Number Quantity Per Vehicle ---------------- ------------ --------------------- Lever, Park Brake 25601809 1 as required

NOTE: It is anticipated that about half of the vehicles will require replacement of the Parking Brake Lever Assembly; please order parts accordingly.

WARRANTY CLAIM INFORMATION

Submit claims using only one of the labor-ops below for each vehicle:

REPAIR PERFORMED TOT-PTS FC LAB-OP LHRS ST ---------------------- ------- --- ------- ---- --- Inspect Park Brake Lever 96 V6940 0.2 .1* Assembly Date Code Only, No Replacement

Inspect and Replace Park 96 V6941 1.6 .1* Brake Lever Assembly

* .1 hour for clerical administration may be applied for in the Straight Time (ST) column.

Parts allowance: Current dealer price, plus 30% allowance for handling.

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.