Mack RL, RS, WL, WS (1975-1978): Service brakes, air
Recall 78V030000 · Feb 9, 1978 · Mack Trucks, Incorporated
400
vehicles affected
400
vehicles affected
Facts
- Recall number
- 78V030000
- Date
- Feb 9, 1978
- Maker
- Mack Trucks, Incorporated
- Units affected
- 400
- Kind
- Vehicles
- Component
- Service brakes, air > Supply > Hoses, lines/piping, and fittings
- Model years
- 1975-1978
- Started by
- The maker
- Hazard
- Other or not stated
What is wrong
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
Recall repairs are free of charge.
THE DEALER WILL RELOCATE THE AIR SYSTEM COMPRESSOR GOVERNOR LINE AND PRESSURE RELIEF VALVE TO ELIMINATE MOISTURE ACCUMULATION.
Vehicles covered
4 models, 16 model years in all
Related pages
Questions and answers
Which vehicles are in recall 78V030000?
4 models: Mack RL (1975-1978), Mack RS (1975-1978), Mack WL (1975-1978) and 1 more, about 400 vehicles in all.
What is the fix for recall 78V030000?
THE DEALER WILL RELOCATE THE AIR SYSTEM COMPRESSOR GOVERNOR LINE AND PRESSURE RELIEF VALVE TO ELIMINATE MOISTURE ACCUMULATION.
A recall means the maker found a safety problem and offers a free fix; it does not mean every unit has the problem. Units affected are as reported by the company. Popular models sell more and so have more recalls and complaints. Official public data; texts are shortened. A dealer can tell whether a single vehicle still needs the repair.