NHTSA Campaign 81V088000

SERVICE BRAKES, AIR:CONTROLS:HAND CONTROL/VALVE

Issued by MACK TRUCKS, INCORPORATED · Reported Jul 8, 1981 · 10,000 vehicles affected

What's wrong

THE RETAINING PIN FOR THE BRAKE CONTROL KNOB HAS BEEN MISALIGNED (OFF THE CENTER LINE OF THE VALVE PLUNGER HOLE). THIS CAUSES THE KNOB TO BE OVERSTRESSED AT THE RETAINING PIN HOLE AREA CAUSING IT TO SEPARATE FROM THE VALVE.

Remedy

THE HOLES WILL BE RETOOLED TO PROVIDE CORRECT ALIGNMENT AND PLASTIC KNOBS WILL BE REPLACED BY KNOBS OF STRONGER MATERIAL HAVING METAL REINFORCEMENTS.

Vehicles affected by this recall

Make Model Year Units
MACK F SERIES 1979 10,000
MACK F SERIES 1980 10,000
MACK MC SERIES 1979 10,000
MACK MC SERIES 1980 10,000
MACK R SERIES 1979 10,000
MACK R SERIES 1980 10,000
MACK U SERIES 1979 10,000
MACK U SERIES 1980 10,000

Source: NHTSA Campaign 81V088000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.