The defect
THE PARKING BRAKE DRUM ATTACHMENT BOLTS MAY LOOSEN AND CAUSE A DRIVELINE LOCKUP CONDITION WHEN THE BUS IS STOPPED OR ALMOST STOPPED.
The risk
DRIVELINE LOCK-UP COULD CAUSE LOSS OF VEHICLE CONTROLWITHOUT PRIOR NOTICE, AND RESULT IN A VEHICLE CRASH.
The remedy
REMOVE ALL OF THE PARKING BRAKE DRUM BOLTS, APPLY A RETAINING COMPOUND TO NEW BOLTS, AND TORQUE THE NEW BOLTS TO SPECIFICATION.
NHTSA's own wording · initiated by ODI
Vehicles covered
| Model | Model years |
|---|---|
| Chevrolet B6 | 1986, 1987, 1988, 1989, 1990 |
| GMC B6 | 1986, 1987, 1988, 1989, 1990 |
Components: PARKING BRAKE:DRIVELINE
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Chevrolet B6 | 1986 | 0 | 1 |
| Chevrolet B6 | 1987 | 0 | 1 |
| Chevrolet B6 | 1988 | 0 | 1 |
| Chevrolet B6 | 1989 | 0 | 2 |
| Chevrolet B6 | 1990 | 0 | 2 |
| GMC B6 | 1986 | 0 | 1 |
| GMC B6 | 1987 | 0 | 1 |
| GMC B6 | 1988 | 0 | 1 |
| GMC B6 | 1989 | 0 | 2 |
| GMC B6 | 1990 | 0 | 2 |
Other parking brake recalls in 1991
8 of the 220 recall campaigns reported to NHTSA in 1991 concerned the parking brake; GENERAL MOTORS CORP. filed 1,195 campaigns in all.
| 91V167000 23 Sept 1991 | GENERAL MOTORS CORP. |
| 91V137000 20 Aug 1991 | MERCEDES-BENZ USA, INC. |
| 91V133000 5 Aug 1991 | GENERAL MOTORS CORP. |
| 91V078000 14 May 1991 | CHRYSLER CORPORATION |
| 91V081000 26 Apr 1991 | VOLVO GM HEAVY TRUCK CORP |
| 91V055000 11 Apr 1991 | GENERAL MOTORS CORP. |
| 91V033000 20 Feb 1991 | VOLVO GM HEAVY TRUCK CORP |
NHTSA recalls (public domain) · all recalls of 1991