MACK HMM 1976: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

General Information

NHTSA Campaign ID Number: 78V068000

Make Model Year
MACK HMM 1976
Date Owners Notified Date Received by ODI Date Added to Database
1978-09-01 1978-04-04 1979-10-12

Production Dates: 1974-10-01 - 1976-03-01

Manufacturers Involved: Mack Trucks, Inc.

Component: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

Potential Number Of Units Affected: 9700

Report Initiator: ODI ODI Report

Summary

AN AXLE "NO BRAKE" CONDITION COULD RESULT FROM AN EATON CONTROLLER INTERNAL ELECTRICAL MALFUNCTION. THIS CONDITION MAY CAUSE THE ANTI-WHEEL LOCK VALVE SOLENOID TO BE CONTINUOUSLY ENERGIZED AND PREVENT THE BRAKES FROM BEING APPLIED ON ONE OF THE AXLES. AS A RESULT, THE ANTI-WHEEL LOCK WARNING LAMP IS NOT ACTIVATED.

Remedy

THE DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE ANTI-WHEEL LOCK CONTROLLER WITHOUT CHARGE TO OWNER.

Notes

VEHICLE DESCRIPTION: TRUCKS EQUIPPED WITH EATON 21 ANTI-LOCK CONTROLLERS.SYSTEM: SERVICE BRAKES; ANTI-WHEEL LOCK SOLENOID.CONSEQUENCES OF DEFECT: LOSS OF BRAKES ON ANY ONE AXLE WILL RESULT IN EXTENDEDVEHICLE STOPPING DISTANCES, WHICH COULD LEAD TO A VEHICLE ACCIDENT.