MACK CH 1989: SERVICE BRAKES, AIR:CONTROLS:FOOT CONTROL/VALVE

General Information

NHTSA Campaign ID Number: 89V178000

Make Model Year
MACK CH 1989
Date Owners Notified Date Received by ODI Date Added to Database
1989-11-10 1989-10-23 1989-10-31

Production Dates: 1988-11-01 - 1989-10-01

Manufacturers Involved: Mack Trucks, Inc.

Component: SERVICE BRAKES, AIR:CONTROLS:FOOT CONTROL/VALVE

Potential Number Of Units Affected: 3652

Report Initiator: MFR MFR Report

Summary

INTERNAL COMPONENTS OF THE E-12 DUAL CIRCUIT AIR BRAKE VALVES MAY BE MISASSEMBLED SO THAT ONE OF THE TAPERED SNAP RINGS IS UPSIDE DOWN.

Consequence

THE SNAP RING CAN COME OUT CAUSING THE VALVE TOMALFUNCTION AND APPLY THE TRUCK'S BRAKE SYSTEM WITHOUT WARNING; THIS COULDRESULT IN LOSS OF CONTROL AND A CRASH.

Remedy

REPLACE MISASSEMBLED VALVES.

Notes

SYSTEM: AIR BRAKE VALVES.VEHICLE DESCRIPTION: TRUCKS