DMM: SERVICE BRAKES, AIR:ANTILOCK:INTERCONNECTING ASSEMBLY(WIRING)

Go Back To 1977 MACK TRUCKS, INC Directory

NHTSA Campaign Number:	78V210000
Vehicle/Equipment Make:	MACK
Vehicle/Equipment Model:	DMM
Model Year:	1977
Manufacturer Campaign Number:
Manufacturer Component Description:	SERVICE BRAKES, AIR:ANTILOCK:INTERCONNECTING ASSEMBLY(WIRING)
Manufacturers Involved in Recall:	MACK TRUCKS, INCORPORATED
Manufacturered:	19771001 - 19780901
Type of Report:	V (Vehicle, Equipment or Tire)
Potential Number of Units Affected:	19370
Date Owner Notified By Manufacturer:	19781107
Recall Initiated By:	19781107
Manufacturer Responsible For Recall:	MACK TRUCKS, INC
Report Received Date:	19781003
Record Creation Date:	19791012
Regulation Part Number:	571
Federal Motor Vehicle Safety Standard Number:	121
Defect Summary:	DELAYS OF UP TO ABOUT 2 SECONDS MAY EXIST IN THE BRAKE APPLICATION TIMES TO THE BRAKES ON THE BOGIE AXLES IN THE PRESENCE OF CERTAIN TYPES OF WHEEL SPEED SENSOR SIGNAL DISCONTINUITIES OR DISTORTIONS THAT MAY OCCUR AS A RESULT OF SENSOR WIRE FAILURE. THIS CONSTITUTES A NON-COMPLIANCE TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS".
Consequence Summary:
Corrective Summary:	DEALER WILL INSTALL NEW WHEEL SPEED SENSORS THAT INCORPORATE IMPROVED WIRING AND THE PRESENT BOGIE ANTI-WHEEL LOCK SYSTEM WILL BE CHANGED TO AN AXLE-TO-AXLE SYSTEM FOR IMPROVED RELIABILITY.

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