Recall 10V404 affects 369 2008-2011 Mack Gu and Mru trucks for air-brake timing that exceeds federal limits. Repair is free at any franchised Mack dealer.
Mack is recalling 369 2008-2011 Gu and Mru vehicles equipped with a front tow glad hand option because the air brake actuation and release timing exceeds the federal limit. Brake timing that falls outside the standard can keep the brakes from performing as intended, raising crash risk, and the Mack dealer repair will be free once available.
Does this recall apply to your specific vehicle?
The official, free per-VIN recall check is run by NHTSA. Enter your VIN and we'll forward you directly — and add you to a free watchlist so you hear about new recalls for your vehicle.
Check my VIN at NHTSARecallNotify doesn't check your VIN — NHTSA's official tool does. We use your email only to alert you to new recalls.
Watch this vehicle for recalls
Add it to your free watchlist and we will alert you as new federal recalls are posted for your year, make and model. New-recall alerts are rolling out now.
You are on the watchlist.
We will email you as new federal recalls are posted for your vehicle.
What's wrong?
The front tow glad hand on 2008-2011 Mack Gu and Mru trucks is an air-brake coupling at the front of the truck. It gives towing or service equipment a connection point to the truck's air brake system. In normal operation, the air brake system sends and releases air pressure on a controlled schedule so the brakes apply and release within the required time limit.
On the affected trucks, the brake actuation and release timing exceeds the allowed limit when the front tow glad hand option is installed. The issue is timing, not an owner adjustment. Air pressure is not applying and releasing within the required time window, so the system does not meet the federal air-brake performance requirement for these trucks.
There is no warning sign before failure. The recall does not identify a dash light, sound, pedal feel change, or other symptom for the driver to watch for before the timing problem is present.
Who's affected?
Covers Gu and Mru truck models across the 2008-2011 model years, all tied to the same brake system component.
| 2009 Mack Gu | brake system |
|---|---|
| 2009 Mack Mru | brake system |
| 2008 Mack Gu | brake system |
| 2008 Mack Mru | brake system |
| 2010 Mack Gu | brake system |
| 2011 Mack Gu | brake system |
| 2010 Mack Mru | brake system |
| 2011 Mack Mru | brake system |
| Units affected | 369 |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific truck.
What's the safety risk?
If the brakes do not perform as intended, stopping control is reduced and a crash can result. Have the vehicle checked promptly, and avoid heavy loads or trips that make braking harder until the recall work is complete. Repair will be free at any franchised Mack dealer once available.
What should I do?
- Check your VIN to confirm your 2008-2011 Mack Gu or Mru is included in this recall.
- Contact a franchised Mack dealer to ask for the free air-brake repair for the front tow glad hand timing defect.
- Reference recall number 10V404 when you call Mack or the dealer.
- Bring the recall notice if you have it, and ask the dealer to confirm that the brake actuation and release timing repair is complete.
- Drive with extra stopping distance until the repair is confirmed, since brake performance is the safety issue in this recall.
What happens at the repair
At the dealer, a Mack technician repairs the front tow glad hand air-brake setup so the actuation and release timing is brought back within the required limit for the air brake system. Mack's filing says the safety recall began on February 1, 2011, and the vehicle repair is free of charge. Parts and labor are covered under the recall. The filing does not give a separate repair time, so ask the Mack service desk what to expect when scheduling the truck.
Timeline
| September 7, 2010 | NHTSA published the recall |
|---|---|
| February 1, 2011 | Owner notification mailed |
Frequently asked questions
What is recall 10V404?
Recall 10V404 covers 369 2008-2011 Mack Gu and Mru trucks built with the front tow glad hand option. The air brake actuation and release timing does not meet Federal Motor Vehicle Safety Standard No. 121, and Mack repairs the issue for free.
What should I do if my 2008-2011 Mack Gu or Mru is on this recall?
Check your VIN to confirm your specific truck is included in recall 10V404. If it is, contact a franchised Mack dealer to schedule the air brake repair. Reference recall number 10V404 when you call, and ask whether Mack needs the truck brought in or handled through fleet service.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair covered safety defects at no cost, and Mack's remedy says the vehicle will be repaired free of charge. A franchised Mack dealer can confirm the repair path for your VIN.
What is the safety risk?
The risk is brake performance that does not meet the required air brake timing standard. If the brakes do not perform as they should, the truck has increased crash risk. Confirm your VIN and schedule the free Mack dealer repair if the recall applies.
What if I bought my Mack Gu or Mru used?
The free repair still applies. Recall eligibility follows the VIN, not the original owner. If you bought the truck used and never received a letter, check your VIN, then contact a Mack dealer with recall number 10V404.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/10V404000 |
|---|---|
| Mack customer service | 1-877-800-4945 |
| NHTSA recall # | 10V404 |
| NHTSA recall # (full) | 10V404000 |
Source documents
-
Download Recall Investigation Document (PDF) (PDF) - Download Recall Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Defect / Noncompliance Notice (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 3, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →