Mack Recall 80V052000: Parking Brake, Driveline, Air

NHTSA recall 80V052000 · announced May 6, 1980 · filed by Mack Trucks, Incorporated · 9,666 units affected

The problem

ON CERTAIN VEHICLES, THE KNOB THAT OPERATES THE TRACTOR PARK VALVE MAY BREAK OFF, RENDERING THE VALVE INOPERABLE.

What to do

DEFECTIVE KNOBS WILL BE REPLACED WITH AN IMPROVED TYPE, WITHOUT CHARGE TO OWNER.

Official NHTSA recall notice →

Notes

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.

Vehicles covered by this recall

• 1979 Mack Mc Series
• 1980 Mack Mc Series
• 1979 Mack R Series
• 1980 Mack R Series
• 1979 Mack U Series
• 1980 Mack U Series

Source: National Highway Traffic Safety Administration public recall data. This page reports official records and is not legal, medical, or repair advice.