PACCAR Incorporated: Service Brakes, Air › Supply › Quick Release Valve
PACCAR Incorporated reported this defect to federal regulators on Jul 8, 2026 and put the number of vehicles at risk at 8. The repair is free for as long as the recall stands.
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.
3 model years covered
Newest first| Vehicle | Complaints | Recalls | Fires | Crashes |
|---|---|---|---|---|
| 2027 Kenworth T680 | 1 | 4 | 0 | 0 |
| 2027 Peterbilt 579 | 0 | 4 | 0 | 0 |
| 2026 Peterbilt 579 | 1 | 2 | 0 | 0 |
What this page is, and what to do next
A recall is not an opinion. It is a Part 573 report a manufacturer is required by federal law to file once it decides a defect poses an unreasonable risk to safety, and it commits them to repairing the vehicle at no cost to the owner. The three passages above are the manufacturer’s own wording as published by NHTSA.
This page describes the campaign. It cannot tell you whether one particular car has already been through the shop — that is tracked by VIN, and only the manufacturer knows it. Check yours at nhtsa.gov/recalls or with a franchised dealer, quoting campaign number 26V442000.
Full record for the 2027 Kenworth T680 → · Recalls carrying a do-not-drive advisory → · Where this data comes from →