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.
Consequence & remedy
Consequence: Not supplied
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.
THE INVOLVED VEHICLES ARE EQUIPPED WITH SAFETY COMPLIANCE CERTIFICATION LABELS AND INCOMPLETE VEHICLE DOCUMENTS THAT INDICATE THAT THE GROSS AXLE WEIGHT RATING (GAWR) IS APPROXIMATELY 0.6 TO 6.0 PERCENT GREATER THAN THE COMBINED LOAD CAPACITY OF THE TIRES AT THE SPECIFIED TIRE INFLATION PRESSURE. THIS FAILS TO COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NOS. 120, "AIR BRAKE SYSTEMS", AND 119, "NEW PNEUMATIC TIRES FOR VEHICLES OTHER THAN PASSENGER CARS", OR 109, "NEW PNEUMATIC TIRES".
Consequence & remedy
Consequence: Not supplied
Remedy: OWNER WILL RECEIVE CORRECT LABELS BY MAIL, FREE OF CHARGE.
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NHTSA investigations
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1978 Ford F Series Problems, Complaints & Recalls | Skip That Year