NHTSA Recall 78V030000
NHTSA Campaign Id 78V030000; Date: Feb. 9, 1978
Recalled Vehicles:
1975 Mack RL; 1976 Mack RL; 1977 Mack RL; 1978 Mack RL; 1975 Mack RS; 1976 Mack RS; 1977 Mack RS; 1978 Mack RS; 1975 Mack WL; 1976 Mack WL; 1977 Mack WL; 1978 Mack WL; 1975 Mack WS; 1976 Mack WS; 1977 Mack WS; 1978 Mack WS
Component: Service Brakes, Air:supply:hoses, Lines/piping, And Fittings
Manufactured by: Mack Trucks, Incorporated
Affected Units:: 400
Recall Summary:
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 to Fix:
The dealer will relocate the air system compressor governor line and pressure relief valve to eliminate moisture accumulation.
Recall 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.
Date Owners notified by Manufacturer: Aug 23, 1978
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