FORD F SERIES 1984: PARKING BRAKE:DRIVELINE:AIR

General Information

NHTSA Campaign ID Number: 85V168000

Make Model Year
FORD F SERIES 1984
Date Received by ODI Date Added to Database
1985-12-20 1986-01-14

Production Dates: 1983-08-01 - 1985-06-01

Manufacturers Involved: Ford Motor Company

Component: PARKING BRAKE:DRIVELINE:AIR

Potential Number Of Units Affected: 51500

Report Initiator: MFR MFR Report

Summary

THE HYDRAULIC PARKING BRAKE CONTROL VALVE MAY INADVERTENTLY ACTIVATE DUE TO MOMENTARY PRESSURE DISRUPTIONS WITHIN THE SYSTEM AND CAUSE THE PARKING BRAKE TO BE APPLIED, STOPPING OR SLOWING THE TRUCK UNEXPECTEDLY. CONSEQUENCE OF DEFECT: THIS UNEXPECTED STOPPING OR SLOWING OF THE TRUCK MAY INCREASE THE RISK OF A REAR END COLLISION SINCE THE BRAKE "STOP" LIGHTS ARE NOT ACTIVATED. ALSO, ON CERTAIN ROAD CONDITIONS THIS OCCURRENCE MAY RESULT IN LOSS OF VEHICLE CONTROL WHICH WOULD LEAD TO AN ACCIDENT.

Remedy

REPLACE THE PUSH-PULL TYPE BRAKE CONTROL VALVE WITH NEW OVER-CENTER CAM TYPE VALVES.

Notes

SYSTEM: HYDRAULIC PARKING BRAKE CONTROL VALVE.VEHICLE DESCRIPTION: MEDIUM AND HEAVY TRUCK AND BUS CHASSIS EQUIPPED WITH HYDRAULIC BRAKES.