Peterbilt 548: Service brakes — proportioning relay valve

Affects Peterbilt 548 · 2027 — about 58 vehicles.

The hazard

Delayed brake response time can increase the risk of a crash.

What to do

Dealers will replace the front brake valves and hoses, free of charge. Owner notification letters are expected to be mailed October 31, 2026. Owners may contact Peterbilt's customer service at 1-940-591-4220. PACCAR's number for this recall is 26PACF.

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