The Recall Desk
HighNHTSA·26V442000·Announced 2026-08-07

PETERBILT 579 Tractors Recalled for Air Brake Valve Installation

PACCAR is recalling certain 2026–2027 Peterbilt 579 and 2027 Kenworth T680 tractors with a potentially incorrectly installed trailer air connection quick release valve that can cause trailer instability after braking.

What this means for you

Real risk of harm even if no illness or injury has been reported yet. Stop using the product and follow the agency's guidance.

Our severity reasoning: The defect affects a safety-critical component (air brakes) and creates a risk of crash/loss of vehicle control. Although no illnesses or injuries are reported and the remedy has been completed for all units, the structural nature of the brake-system defect and the stated risk of increased crash potential satisfies the High severity threshold for risk-of-harm vehicle defects.

Plain-English summary

PACCAR Incorporated is recalling certain 2026–2027 Peterbilt 579 tractors and 2027 Kenworth T680 tractors due to a defect in the air brake system. The trailer air connection quick release (QR) valve may have been incorrectly installed, which can prevent the valve from functioning properly.

An incorrectly installed quick release valve that does not function properly can cause the trailer to become unstable after the driver applies the brakes, increasing the risk of a crash. These vehicles fail to comply with Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."

All affected tractors have been repaired. Owners may contact Peterbilt's customer service at 1-940-591-4220 or Kenworth's customer service at 1-425-828-5888 for more information.

The recalled product

Product
2027 PETERBILT 579
Brand
PETERBILT
Manufacturer
PACCAR Incorporated
Category
Vehicle — Heavy Truck / Tractor
Hazard
  • brake-defect
  • crash-risk
  • vehicle-instability
Affected units
8

Is your product affected?

Check your packaging against the codes below. If any of them match, the product is part of this recall.

Model numbers (2)

  • 579
  • T680

Distribution

Distributed nationwide across the United States.

Related recalls

Same brand · PETERBILT

Same category