The defect
THE QUICK RELEASE VALVE SUPPORT BRACKET MOUNTED ON THE AXLE MAY CRACK. THIS CAUSES FATIGUE FAILURE OF THE STEEL AIR LINES LEADING TO THE REAR PARKING BRAKES AND CHASSIS SERVICE BRAKES RESULTING IN SUDDEN LOSS OF AIR PRESSURE. CONSEQUENCE OF DEFECT: THIS SUDDEN LOSS OF AIR TO THE BRAKE CHAMBERS WILL RESULT IN AUTOMATIC ACTUATION OF REAR PARKING BRAKE CAUSING SUDDEN REAR WHEEL LOCKUP WHICH MAY CONTRIBUTE TO AN ACCIDENT.
The remedy
INSTALL A REDESIGNED VALVE SUPPORT BRACKET.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Mack MR600P | 1984, 1985 |
| Mack MS250P | 1984, 1985 |
Components: PARKING BRAKE:DRIVELINE:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Mack MR600P | 1984 | 0 | 1 |
| Mack MR600P | 1985 | 0 | 1 |
| Mack MS250P | 1984 | 0 | 1 |
| Mack MS250P | 1985 | 0 | 1 |
Other parking brake recalls in 1985
7 of the 173 recall campaigns reported to NHTSA in 1985 concerned the parking brake; MACK TRUCKS, INCORPORATED filed 245 campaigns in all.
| 85V168000 20 Dec 1985 | FORD MOTOR COMPANY |
| 85V133000 22 Oct 1985 | NAVISTAR INTL CORP. |
| 85V124000 7 Oct 1985 | GENERAL MOTORS CORP. |
| 85V103000 14 Aug 1985 | VOLVO GM HEAVY TRUCK CORP |
| 85V092000 22 Jul 1985 | IVECO TRUCK OF N.A., INC. |
| 85V055000 1 May 1985 | ELDORADO MOTOR CORP. |
NHTSA recalls (public domain) · all recalls of 1985