2027 Kenworth T680, 2026–2027 Peterbilt 579 Recall: Trailer air connection quick release (QR) valve in the air brake system…

NHTSA campaign 26V442000 · Service Brakes, Air · filed Jul 8, 2026 · verified Jul 30, 2026

Units reported

Manufacturer

PACCAR Incorporated

Risk

Crash / injury

Owner letters

—

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.

Check whether your specific vehicle is affected

Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.

Check VIN on NHTSA →

The fix — what to do

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.

Affected vehicles

Make	Model	Model years
Kenworth	T680	2027
Peterbilt	579	2026, 2027

Related recalls

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Other campaigns involving Kenworth vehicles

All Kenworth T680 recalls → · All Kenworth recalls →

Source: NHTSA recall database, campaign 26V442000 (manufacturer number 26PACC). Data last verified Jul 30, 2026.