FORD LN7000 1989: SERVICE BRAKES, AIR:CONTROLS

General Information

NHTSA Campaign ID Number: 90V121000

Make Model Year
FORD LN7000 1989
Date Owners Notified Date Received by ODI Date Added to Database
1990-08-20 1990-06-25 1990-06-26

Production Dates: 1989-03-01 - 1990-01-01

Manufacturers Involved: Ford Motor Company

Component: SERVICE BRAKES, AIR:CONTROLS

Potential Number Of Units Affected: 15260

Report Initiator: MFR MFR Report

Summary

SECONDARY SERVICE RESERVOIR AIR CHECK VALVES MAY NOT SEAT PROPERLY DUE TO A MECHANICAL INTERFERENCE CONDITION BETWEEN A CIRCULAR BRASS GUIDE AND THE WALL OF A CYLINDRICAL FERRULE IN WHICH THE BRASS GUIDE IS INTENDED TO MOVE FREELY.

Consequence

IN THE EVENT OF PRESSURE LOSS IN THE SUPPLY RESERVOIR,A DEFECTIVE CHECK VALVE WOULD ALLOW PRESSURE EQUALIZATION BETWEEN PRIMARY ANDSECONDARY SERVICE RESERVOIRS, PRESENTING THE POTENTIAL FOR LOSS OR ABSENCE OFFRONT BRAKING ABILITY, WHICH COULD CAUSE LOSS OF CONTROL AND AN ACCIDENT.

Remedy

INSTALL REVISED DESIGN SECONDARY SERVICE RESERVOIR CHECK VALVE COMPONENTS.

Notes

SYSTEM: AIR PRESSURE CHECK VALVES.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS AND CHASSIS CABS.