FORD F SERIES 1977: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

General Information

NHTSA Campaign ID Number: 79V077000

Make Model Year
FORD F SERIES 1977
Date Owners Notified Date Received by ODI Date Added to Database
1979-11-09 1979-03-29 1979-10-12

Production Dates: 1975-02-01 - 1979-03-01

Manufacturers Involved: Ford Motor Company

Component: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

Potential Number Of Units Affected: 65000

Report Initiator: MFR MFR Report

Summary

CERTAIN AIR BRAKE ANTI-LOCK MODULATORS COULD MALFUNCTION DURING OPERATION OF THE ANTI-LOCK SYSTEM. A NYLON PISTON WITHIN THE MODULATOR AIR VALVE SYSTEM CAN SWELL FROM EXPOSURE TO SYSTEM CONTAMINANTS. CONTINUED EXPOSURE MAY CAUSE THE PISTON TO SWELL TO THE EXTENT THAT INTERFERENCE WITH THE CYLINDER WALL WILL RESULT, CAUSING MOMENTARY STICKING OR A PERMANENT JAM. THIS CAN RESULT IN TEMPORARY OR PERMANENT LOSS OF BRAKING FOR THE AFFECTED AXLE.

Remedy

THE PISTONS IN THE VALVE PORTION OF THE MODULATORS WILL BE REPLACED WITH PISTONS THAT DO NOT SWELL WHEN EXPOSED TO AIR BRAKE SYSTEM CONTAMINANTS.

Notes

VEHICLE DESCRIPTION: HEAVY TRUCKS EQUIPPED WITH ANTI-LOCK AIR BRAKECONTROLLERS.SYSTEM: SERVICE BRAKES; CONTROL ASSEMBLY.