Mack Recall 78V210000: Service Brakes, Air, Antilock, Interconnecting Assembly(wiring)

NHTSA recall 78V210000 · announced October 3, 1978 · filed by Mack Trucks, Incorporated · 19,370 units affected

The problem

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".

What to do

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.

Official NHTSA recall notice →

Notes

VEHICLE DESCRIPTION: HEAVY TRUCKS.SYSTEM: SERVICE BRAKES; ELECTRICAL WIRING AND CONNECTORS.CONSEQUENCES OF DEFECT: THIS DELAY IN EFFECTIVE BRAKING ACTION COULD LEAD TO ANACCIDENT UNDER CERTAIN TRAFFIC CONDITIONS.

Vehicles covered by this recall

• 1977 Mack Dm
• 1978 Mack Dm
• 1977 Mack Dmm
• 1978 Mack Dmm
• 1977 Mack F
• 1978 Mack F
• 1977 Mack Mb
• 1978 Mack Mb
• 1977 Mack R
• 1978 Mack R
• 1977 Mack Rd
• 1978 Mack Rd
• 1977 Mack Rl
• 1978 Mack Rl
• 1977 Mack Rm
• 1978 Mack Rm
• 1977 Mack Rs
• 1978 Mack Rs
• 1977 Mack Rwl
• 1978 Mack Rwl
• 1977 Mack Rws
• 1978 Mack Rws
• 1977 Mack U
• 1978 Mack U
• 1977 Mack Wl
• 1978 Mack Wl
• 1977 Mack Ws
• 1978 Mack Ws

Source: National Highway Traffic Safety Administration public recall data. This page reports official records and is not legal, medical, or repair advice.