MACK MR600P 1984: PARKING BRAKE:DRIVELINE:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS
NHTSA Campaign ID Number: 85V159000
| Make | Model | Year |
|---|---|---|
| MACK | MR600P | 1984 |
| Date Owners Notified | Date Received by ODI | Date Added to Database |
| 1986-11-26 | 1985-11-26 | 1985-12-04 |
Production Dates: 1984-07-01 - 1985-10-01
Manufacturers Involved: Mack Trucks, Inc.
Component: PARKING BRAKE:DRIVELINE:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS
Potential Number Of Units Affected: 3308
Report Initiator: MFR MFR Report
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.
INSTALL A REDESIGNED VALVE SUPPORT BRACKET.
SYSTEM: PARKING BRAKES AIR LINES, QUICK RELEASE VALVE BRACKET.VEHICLE DESCRIPTION: MID-LINER TRUCKS.
