MACK WS 1976: SERVICE BRAKES, AIR:DRUM

General Information

NHTSA Campaign ID Number: 77V013000

Make Model Year
MACK WS 1976
Date Received by ODI Date Added to Database
1977-01-01 1983-08-29

Production Dates: 1975-01-01 - 1975-12-01

Manufacturers Involved: Mack Trucks, Inc.

Component: SERVICE BRAKES, AIR:DRUM

Potential Number Of Units Affected: 830

Report Initiator: MFR MFR Report

Summary

CRACKS MAY BE PRESENT IN THE BRAKE SPIDER. THESE CRACKS COULD EVENTUALLY CAUSE THE BRAKE SPIDER TO FAIL. THIS COULD ALLOW SEPARATION OF THAT PORTION OF THE BRAKE SPIDER THAT RETAINS THE BRAKE CAMSHAFT, THE BRAKE CHAMBER, AND THE BRAKE CHAMBER BRACKET FROM THE FOUNDATION BRAKE ASSEMBLY. BRAKE PULL IN THE DIRECTION OPPOSITE THE AFFECTED WHEEL LOCATION OR WHEEL LOCK-UP ON THE AFFECTED WHEEL COULD OCCUR.

Remedy

THE DEALER WILL INSPECT AND MODIFY THE AFFECTED BRAKE SPIDERS, FREE OF CHARGE.

Notes

VEHICLE DESCRIPTION: TRUCKS.SYSTEM: SERVICE BRAKES; FRONT AXLE CAM, BRAKE SPIDER.CONSEQUENCES OF DEFECT: BRAKE DEGRADATION AND WHEEL LOCK-UP COULD CAUSE LOSS OFVEHICLE CONTROL AND AN ACCIDENT.