Mack 1984–1985 Parking Brake recall
Recalled November 26, 1985 · NHTSA recall 85V159000 · Mack
Description
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.
What to do
INSTALL A REDESIGNED VALVE SUPPORT BRACKET.
Source: U.S. National Highway Traffic Safety Administration. Official recall notice on nhtsa.gov →