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Mack F Series Recall 81V088: Service Brakes, Air:Controls:Hand Control/Valve

NHTSA campaign 81V088, reported July 8, 1981, 10,000 vehicles potentially affected.

Check whether this recall is open on your vehicle

The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 81V088MACK TRUCKS, INCORPORATED
Component
SERVICE BRAKES, AIR:CONTROLS:HAND CONTROL/VALVE
Problem
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.
Risk
Remedy
THE HOLES WILL BE RETOOLED TO PROVIDE CORRECT ALIGNMENT AND PLASTIC KNOBS WILL BE REPLACED BY KNOBS OF STRONGER MATERIAL HAVING METAL REINFORCEMENTS.
Notes
VEHICLE DESCRIPTION: TRUCKS EQUIPPED WITH BRAKE CONTROL KNOBS.SYSTEM: SERVICE BRAKES; KNOB RETAINING PIN.CONSEQUENCES OF DEFECT: WITH THE KNOB BROKEN OFF, THE CONTROL VALVE WOULDBECOME DIFFICULT OR IMPOSSIBLE TO OPERATE. ONE OR A COMBINATION OF BRAKEAPPLICATIONS WOULD NOT BE POSSIBLE AND THE VEHICLE COULD BE PARKED IN AN UNSAFECONDITION. AN ACCIDENT AND PERSONAL INJURY COULD RESULT.

Affected vehicles

Mack F Series1980
Mack MC Series1980
Mack R Series1980
Mack U Series1980