Peterbilt 579: Service brakes — quick release valve

Affects Peterbilt 579 · 2026–2027 — about 8 vehicles.

The hazard

An incorrectly installed quick release valve that does not function properly can increase the risk of a crash.

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.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational