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NHTSA·Commercial vehicles·July 8, 2026

PACCAR recalls 2026–2027 Peterbilt 579 and 2027 Kenworth T680 tractors over incorrectly installed trailer air brake valve

A valve in the trailer air brake connection may have been installed wrongly, which can make the trailer unstable after the driver brakes and raise the risk of a crash.

What to do

All 8 affected tractors have already been repaired free of charge, so no owner letters are being sent. Owners can call Peterbilt customer service at 1-940-591-4220 or Kenworth customer service at 1-425-828-5888.

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NHTSA recall page

Recall details

Product
Peterbilt 579, T680 2026–2027
Company
PACCAR Incorporated
Hazard
An incorrectly installed quick release valve that does not function properly can increase the risk of a crash.
Units
8 vehicles
Reported to NHTSA
July 8, 2026
Identifiers
  • NHTSA campaign number: 26V442000
  • Manufacturer campaign number: 26PACC
  • Model years: 2026–2027

The headline, summary and steps above are written in plain English from the official notice below. Identifiers are copied exactly as the agency published them. Always check the official notice before you act.

Official notice

The notice's own wording from NHTSA.

Component
SERVICE BRAKES, AIR:SUPPLY:QUICK RELEASE VALVE
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."
Consequence
An incorrectly installed quick release valve that does not function properly can increase the risk of a crash.
Corrective action
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.

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