MACK U SERIES 1980: PARKING BRAKE:DRIVELINE:AIR
NHTSA Campaign ID Number: 80V052000
| Make | Model | Year |
|---|---|---|
| MACK | U SERIES | 1980 |
| Date Owners Notified | Date Received by ODI | Date Added to Database |
| 1980-10-20 | 1980-05-06 | 1980-07-18 |
Production Dates: 1979-07-01 - 1980-01-01
Manufacturers Involved: Mack Trucks, Inc.
Component: PARKING BRAKE:DRIVELINE:AIR
Potential Number Of Units Affected: 9666
Report Initiator: MFR MFR Report
ON CERTAIN VEHICLES, THE KNOB THAT OPERATES THE TRACTOR PARK VALVE MAY BREAK OFF, RENDERING THE VALVE INOPERABLE.
DEFECTIVE KNOBS WILL BE REPLACED WITH AN IMPROVED TYPE, WITHOUT CHARGE TO OWNER.
VEHICLE DESCRIPTION: TRUCKS.SYSTEM: SERVICE BRAKES; TRACTOR PARK VALVE CONTROL KNOB.CONSEQUENCES OF DEFECT: THE PURPOSE OF THE TRACTOR PARK VALVE IS TO ALLOW THEDRIVER TO APPLY THE TRACTOR SPRING EMERGENCY/PARKING BRAKE INDEPENDENTLY OF THETRAILER EMERGENCY PARKING BRAKES. IF THE KNOB IS BROKEN, THE TRACTOR PARKINGBRAKES CANNOT BE APPLIED. IF PARKED ON AN INCLINE AND LEFT UNATTENDED, VEHICLECOULD ROLL FREE AND CAUSE ACCIDENT AND INJURY.
