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NHTSA Campaign 85V159000

PARKING BRAKE:DRIVELINE:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS

Issued by MACK TRUCKS, INCORPORATED · Reported Nov 26, 1985 · 3,308 vehicles affected

What's wrong

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.

Remedy

INSTALL A REDESIGNED VALVE SUPPORT BRACKET.

Vehicles affected by this recall

Make Model Year Units
MACK MR600P 1984 3,308
MACK MR600P 1985 3,308
MACK MS250P 1984 3,308
MACK MS250P 1985 3,308

Source: NHTSA Campaign 85V159000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.