Recall 78V-030: 1975–1978 Mack RL, 1975–1978 Mack RS and 2 more
MACK TRUCKS, INCORPORATED recall for service brakes, air, reported to NHTSA on Feb 9, 1978, covering about 400 vehicles.
The problem
A design deficiency exists in the air dryer piping in the area of the pressure relief valve and compressor governor control link. Moisture is passed and builds up in this relief valve and control line. In freezing ambient temperatures, this moisture may freeze, allowing the chassis air system pressure to exceed 150 PSI. Excessive air system pressure can cause separation of air piping connections and air system valve failure.
The fix
The dealer will relocate the air system compressor governor line and pressure relief valve to eliminate moisture accumulation.
Notes
Vehicle description: trucks equipped with anchorlok air dryers.system: service brakes; air system and governor control line (Air dryer).consequences of defect: when this occurs, automatic application of the chassisemergency spring brakes and trailer brakes could cause loss of vehicle controlwithout prior warning and a vehicle accident.note: owner/driver is advised not to operate vehicle if air pressure exceeds15o PSI.
Recall details
| Manufacturer | MACK TRUCKS, INCORPORATED |
|---|---|
| Component | Service Brakes, Air › Supply › Hoses, Lines/Piping, and Fittings |
| Recall started by | the manufacturer |
| NHTSA campaign number | 78V030000 |
Vehicles in this recall
| Vehicle | Model years | |
|---|---|---|
| Mack RL | 1975, 1976, 1977, 1978 | All years |
| Mack RS | 1975, 1976, 1977, 1978 | All years |
| Mack WL | 1975, 1976, 1977, 1978 | All years |
| Mack WS | 1975, 1976, 1977, 1978 | All years |
Not every vehicle of these model years is included. Enter your VIN at nhtsa.gov/recalls ↗ or ask a dealer.
Frequently asked questions
What is recall 78V-030?
A design deficiency exists in the air dryer piping in the area of the pressure relief valve and compressor governor control link. Moisture is passed and builds up in this relief valve and control line. In freezing ambient temperatures, this moisture may freeze, allowing the chassis air system pressure to exceed 150 PSI. Excessive air system pressure can cause separation of air piping connections and air system valve failure.
How is recall 78V-030 fixed?
The dealer will relocate the air system compressor governor line and pressure relief valve to eliminate moisture accumulation.
Is the recall repair free?
Yes. Safety recall repairs are free at authorized dealers. Check whether your vehicle is included with its VIN at nhtsa.gov/recalls.