MACK MR600P 1985: PARKING BRAKE:DRIVELINE:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS

General Information

NHTSA Campaign ID Number: 85V159000

Make Model Year
MACK MR600P 1985
Date Owners Notified Date Received by ODI Date Added to Database
1986-11-26 1985-11-26 1985-12-04

Production Dates: 1984-07-01 - 1985-10-01

Manufacturers Involved: Mack Trucks, Inc.

Component: PARKING BRAKE:DRIVELINE:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS

Potential Number Of Units Affected: 3308

Report Initiator: MFR MFR Report

Summary

THE QUICK RELEASE VALVE SUPPORT BRACKET MOUNTED ON THE AXLE MAY CRACK. THIS CAUSES FATIGUE FAILURE OF THE STEEL AIR LINES LEADING TO THE REAR PARKING BRAKES AND CHASSIS SERVICE BRAKES RESULTING IN SUDDEN LOSS OF AIR PRESSURE. CONSEQUENCE OF DEFECT: THIS SUDDEN LOSS OF AIR TO THE BRAKE CHAMBERS WILL RESULT IN AUTOMATIC ACTUATION OF REAR PARKING BRAKE CAUSING SUDDEN REAR WHEEL LOCKUP WHICH MAY CONTRIBUTE TO AN ACCIDENT.

Remedy

INSTALL A REDESIGNED VALVE SUPPORT BRACKET.

Notes

SYSTEM: PARKING BRAKES AIR LINES, QUICK RELEASE VALVE BRACKET.VEHICLE DESCRIPTION: MID-LINER TRUCKS.