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NHTSA Campaign 78V030000

SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS

Issued by MACK TRUCKS, INCORPORATED · Reported Feb 9, 1978 · 400 vehicles affected

What's 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.

Remedy

THE DEALER WILL RELOCATE THE AIR SYSTEM COMPRESSOR GOVERNOR LINE AND PRESSURE RELIEF VALVE TO ELIMINATE MOISTURE ACCUMULATION.

Vehicles affected by this recall

Make Model Year Units
MACK RL 1975 400
MACK RL 1976 400
MACK RL 1977 400
MACK RL 1978 400
MACK RS 1975 400
MACK RS 1976 400
MACK RS 1977 400
MACK RS 1978 400
MACK WL 1975 400
MACK WL 1976 400
MACK WL 1977 400
MACK WL 1978 400
MACK WS 1975 400
MACK WS 1976 400
MACK WS 1977 400
MACK WS 1978 400

Source: NHTSA Campaign 78V030000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.