The defect
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 remedy
THE DEALER WILL RELOCATE THE AIR SYSTEM COMPRESSOR GOVERNOR LINE AND PRESSURE RELIEF VALVE TO ELIMINATE MOISTURE ACCUMULATION.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|
Components: SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS
Other service brakes, air recalls in 1978
32 of the 272 recall campaigns reported to NHTSA in 1978 concerned the service brakes, air; MACK TRUCKS, INCORPORATED filed 245 campaigns in all.
| 78V260000 4 Dec 1978 | INTERNATIONAL HARVESTER |
| 78V241000 25 Oct 1978 | HENDRICKSON MFG. CO. |
| 78V235000 23 Oct 1978 | POLAR COMPANY |
| 78V231000 20 Oct 1978 | PIKE TRAILER COMPANY |
| 78V234000 20 Oct 1978 | DORSEY TRAILERS, INC. |
| 78V230000 20 Oct 1978 | BUTLER MANUFACTURING |
| 78V233000 20 Oct 1978 | BUDD COMPANY |
| 78V232000 20 Oct 1978 | WALKER EQUIPMENT |
NHTSA recalls (public domain) · all recalls of 1978