| NHTSA Campaign Number: |
85V159000 |
| Vehicle/Equipment Make: |
MACK |
| Vehicle/Equipment Model: |
MS250P |
| Model Year: |
1985 |
| Manufacturer Campaign Number: |
|
| Manufacturer Component Description: |
PARKING BRAKE:DRIVELINE:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS |
| Manufacturers Involved in Recall: |
MACK TRUCKS, INCORPORATED |
| Manufacturered: |
19840701 - 19851001 |
| Type of Report: |
V (Vehicle, Equipment or Tire) |
| Potential Number of Units Affected: |
3308 |
| Date Owner Notified By Manufacturer: |
19861126 |
| Recall Initiated By: |
19861126 |
| Manufacturer Responsible For Recall: |
MACK TRUCKS, INC |
| Report Received Date: |
19851126 |
| Record Creation Date: |
19851204 |
| Regulation Part Number: |
|
| Federal Motor Vehicle Safety Standard Number: |
|
| Defect Summary: |
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. |
| Consequence Summary: |
|
| Corrective Summary: |
INSTALL A REDESIGNED VALVE SUPPORT BRACKET. |