- Vehicles
- 19,370
- Built between
- Oct 1977 – Sep 1978
- Models
- 14
- Recall type
- Vehicle
- Initiated by
- Manufacturer
- Owners notified
- 7 November 1978
- Repaired
- Not reported
- Unrepaired
- Not reported
Does this affect my vehicle?
This recall covers vehicles built between October 1977 and September 1978. If yours was built outside that window, it is not part of this recall.
- 1977-1978 Mack DMBuilt October 1977 to September 1978
- 1977-1978 Mack DMMBuilt October 1977 to September 1978
- 1977-1978 Mack FBuilt October 1977 to September 1978
- 1977-1978 Mack MBBuilt October 1977 to September 1978
- 1977-1978 Mack RBuilt October 1977 to September 1978
- 1977-1978 Mack RDBuilt October 1977 to September 1978
- 1977-1978 Mack RLBuilt October 1977 to September 1978
- 1977-1978 Mack RMBuilt October 1977 to September 1978
- 1977-1978 Mack RSBuilt October 1977 to September 1978
- 1977-1978 Mack RWLBuilt October 1977 to September 1978
- 1977-1978 Mack RWSBuilt October 1977 to September 1978
- 1977-1978 Mack UBuilt October 1977 to September 1978
- 1977-1978 Mack WLBuilt October 1977 to September 1978
- 1977-1978 Mack WSBuilt October 1977 to September 1978
What the defect is
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 gets 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.
Timeline
- Vehicles builtOctober 1977 to September 1978
- Recall reported to NHTSA3 October 1978
- Owners notified7 November 1978
Your rights
A safety recall repair is free. Under US federal law the manufacturer must fix a safety defect at no cost to you — no charge for parts, labor or diagnosis — whether or not you are the original owner. A dealer cannot charge you for recall work, and cannot require you to have bought the vehicle from them.
That entitlement is not unlimited. It applies where the vehicle was first sold less than 15 years before the recall was announced — 5 years for tires. Past that a manufacturer may still do the repair free of charge, and many do, but they are no longer obliged to. This recall was reported on 3 October 1978.
To arrange the repair, contact any franchised dealer for the brand. If a dealer refuses the work or tries to charge for it, you can report that to NHTSA at nhtsa.gov/recalls or on 1-888-327-4236.
Official source
- Recalling manufacturer
- MACK TRUCKS, INCORPORATED
- Safety standard
- FMVSS 121
- Recall initiated by
- MFR
Everything on this page — the models listed, the build dates and the repair figures — comes from the manufacturer's filing to NHTSA and describes the vehicle line as a whole, not any individual car. Only the manufacturer can confirm whether a specific vehicle is affected, and whether its recall work has already been carried out. Check yours by VIN and read the official notice at nhtsa.gov/recalls.
Additional 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.
Check your own vehicle
This page describes the recall, not any one car. To see which recalls cover a specific vehicle, search by make, model and year.
A VIN lookup here identifies your vehicle and shows recalls issued for that make, model and year. It cannot tell you what is still open on your individual car - only the manufacturer knows that. Search by VIN instead, or check your VIN at nhtsa.gov for whether a recall is still open on your individual car.