MACK WS 1975: SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE

General Information

NHTSA Campaign ID Number: 75V141000

Make Model Year
MACK WS 1975
Date Owners Notified Date Received by ODI Date Added to Database
1975-11-17 1975-07-24 1979-10-12

Manufacturers Involved: Mack Trucks, Inc.

Component: SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE

Potential Number Of Units Affected: 935

Report Initiator: MFR MFR Report

Notes

MACK CAMPAIGN NO SCO-63.TRUCKS MFG'D DEC.12, 1974 THRU JUNE 30, 1975.POSSIBILITY THAT THE TRAILER SUPPLY CONTROL VALVE EXHAUST PORT WAS INADVERTENLYPLUGGED, AND THE SAFETY VALVE ON THE AIR RESERVOIR MAY HAVE BEEN OMITTED.IFTHIS CONDITION EXISTS IT COULD LEAD TO INTERMITTENT LOCKUP OF THE TRAILERBRAKES AND DIFFICULTY IN CHARGING THE TRAILER BRAKE AIR SYSTEM.'CORRECT BYINSPECTING AND INSTALLING VALVE AND UNPLUG CONTROL VALVE'.