Recall 78V-210: 1977–1978 Mack DM, 1977–1978 Mack DMM and 12 more
MACK TRUCKS, INCORPORATED recall for service brakes, air, reported to NHTSA on Oct 3, 1978, covering about 19,370 vehicles.
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".
The fix
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.
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.
Recall details
| Manufacturer | MACK TRUCKS, INCORPORATED |
|---|---|
| Component | Service Brakes, Air › Antilock › Interconnecting Assembly(Wiring) |
| Recall started by | the manufacturer |
| NHTSA campaign number | 78V210000 |
Vehicles in this recall
| Vehicle | Model years | |
|---|---|---|
| Mack DM | 1977, 1978 | All years |
| Mack DMM | 1977, 1978 | All years |
| Mack F | 1977, 1978 | All years |
| Mack MB | 1977, 1978 | All years |
| Mack R | 1977, 1978 | All years |
| Mack RD | 1977, 1978 | All years |
| Mack RL | 1977, 1978 | All years |
| Mack RM | 1977, 1978 | All years |
| Mack RS | 1977, 1978 | All years |
| Mack RWL | 1977, 1978 | All years |
| Mack RWS | 1977, 1978 | All years |
| Mack U | 1977, 1978 | All years |
| Mack WL | 1977, 1978 | All years |
| Mack WS | 1977, 1978 | All years |
Not every vehicle of these model years is included. Enter your VIN at nhtsa.gov/recalls ↗ or ask a dealer.
Frequently asked questions
What is recall 78V-210?
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".
How is recall 78V-210 fixed?
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.
Is the recall repair free?
Yes. Safety recall repairs are free at authorized dealers. Check whether your vehicle is included with its VIN at nhtsa.gov/recalls.