Vehicle recall 80V052000 · May 6, 1980
Mack MC Series, R Series and 1 more model
On certain vehicles, the knob that operates the tractor park valve may break off, rendering the valve inoperable.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- On certain vehicles, the knob that operates the tractor park valve may break off, rendering the valve inoperable.
- Remedy
- Defective knobs will be replaced with an improved type, without charge to owner.
- 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.
Recall details
- NHTSA campaign
- 80V052000
- Reported to NHTSA
- May 6, 1980
- Filed by
- MACK TRUCKS, INCORPORATED
- Owner notification
- October 20, 1980
- Vehicles potentially affected
- 9,666
- Initiated by
- the manufacturer
- Components
- Parking brake › Driveline › Air
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
- Mack MC Series (1979-1980): 1980, 1979
- Mack R Series (1979-1980): 1980, 1979
- Mack U Series (1979-1980): 1980, 1979
Has your Mack been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Mack dealer can also check your VIN. Recall repairs are free.