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NHTSA Campaign 78V210000

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

Issued by MACK TRUCKS, INCORPORATED · Reported Oct 3, 1978 · 19,370 vehicles affected

What's wrong

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".

Remedy

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.

Vehicles affected by this recall

Make Model Year Units
MACK DM 1977 19,370
MACK DM 1978 19,370
MACK DMM 1977 19,370
MACK DMM 1978 19,370
MACK F 1977 19,370
MACK F 1978 19,370
MACK MB 1977 19,370
MACK MB 1978 19,370
MACK R 1977 19,370
MACK R 1978 19,370
MACK RD 1977 19,370
MACK RD 1978 19,370
MACK RL 1977 19,370
MACK RL 1978 19,370
MACK RM 1977 19,370
MACK RM 1978 19,370
MACK RS 1977 19,370
MACK RS 1978 19,370
MACK RWL 1977 19,370
MACK RWL 1978 19,370
MACK RWS 1977 19,370
MACK RWS 1978 19,370
MACK U 1977 19,370
MACK U 1978 19,370
MACK WL 1977 19,370
MACK WL 1978 19,370
MACK WS 1977 19,370
MACK WS 1978 19,370

Source: NHTSA Campaign 78V210000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.