Peterbilt and Kenworth recall 26V-442: Incorrectly Installed Quick Release Valve/FMVSS 121
An incorrectly installed quick release valve that does not function properly can increase the risk of a crash.
Campaign facts
- NHTSA campaign
- 26V442000 (26V-442)
- Manufacturer number
- 26PACC
- Filed by
- PACCAR Incorporated
- Report received
- July 8, 2026
- Component
- Service brakes, air:supply:quick release valve
- Vehicles potentially affected
- 8
- Model years
- 2026–2027
- Built between
- March 12, 2025 and February 10, 2026
- Recall initiated by
- The manufacturer
- Safety standard
- FMVSS 121
What is wrong
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.
Why brake defects matter: Reduced braking or a loss of brake assist lengthens stopping distance and increases 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.
About the brakes
The service brakes are the system you use every time you press the pedal — hydraulic or air components plus the electronic controls that manage them.
Vehicles covered by campaign 26V-442
- Kenworth T680 2027
- Peterbilt 579 20272026
What to do
- Enter your VIN in NHTSA’s lookup (below) to confirm that your vehicle is included and that the repair has not already been done.
- Call a dealer for the brand and book the repair. Quote NHTSA campaign 26V-442 and the manufacturer’s number 26PACC.
- If a brake warning lamp comes on or the pedal feels different, have the vehicle inspected before you keep driving it.
- Safety recall repairs are carried out free of charge by the manufacturer’s dealers. If you already paid for this repair yourself, ask the manufacturer about reimbursement and keep your receipt.
Check by VIN
A campaign rarely covers every vehicle of a model year. Enter your 17-character VIN to find the recall campaigns filed for your make, model and model year. The VIN is on the driver’s side of the dashboard (visible through the windshield), on the door-jamb label, and on your registration and insurance documents.
Is a recall still open on your vehicle? Only NHTSA’s official VIN check can say whether a campaign applies to your exact vehicle and whether the repair has already been done.
Your VIN is decoded with NHTSA’s public vPIC service to identify the make, model and year. It is not stored and is not added to any page address.
The official record
This page reproduces the campaign as filed with NHTSA. The NHTSA record is authoritative — if anything here differs, follow the agency.
Open campaign 26V-442 on NHTSA.gov