The defect
PACCAR Incorporated (PACCAR) is recalling certain 2026-2027 Peterbilt 579 and 2027 Kenworth T680 tractors. The trailer air connection quick release (QR) valve in the air brake system may have been incorrectly installed, which can cause the trailer to become unstable after the driver applies the brakes. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
The risk
An incorrectly installed quick release valve that does not function properly can increase the risk of a crash.
The remedy
Paccar inspected and reinstalled the valves, as necessary, free of charge. All affected tractors have been repaired and therefore no owner notification letters are necessary. Owners may contact Peterbilt's customer service at 1-940-591-4220 and Kenworth's customer service at 1-425-828-5888. PACCAR's number for this recall is 26PACC.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Kenworth T680 | 2027 |
| Peterbilt 579 | 2026, 2027 |
Components: SERVICE BRAKES, AIR:SUPPLY:QUICK RELEASE VALVE
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Kenworth T680 | 2027 | 1 | 4 |
| Peterbilt 579 | 2026 | 1 | 2 |
| Peterbilt 579 | 2027 | 0 | 4 |
Other service brakes, air recalls in 2026
11 of the 666 recall campaigns reported to NHTSA in 2026 concerned the service brakes, air; PACCAR Incorporated filed 154 campaigns in all.
| 26V583000 9 Sept 2026 | Daimler Trucks North America, LLC |
| 26V567000 1 Sept 2026 | PACCAR Incorporated |
| 26V506000 4 Aug 2026 | Wabash National Corporation |
| 26V501000 30 Jul 2026 | Autocar, LLC |
| 26V382000 11 Jun 2026 | International Motors, LLC |
| 26V355000 2 Jun 2026 | Nova Bus (US) Inc. |
| 26V294000 11 May 2026 | International Motors, LLC |
| 26V261000 23 Apr 2026 | Mack Trucks, Inc. |
NHTSA recalls (public domain) · all recalls of 2026