Mack Pioneer PR (4), Anthem An (4): Service brakes — control unit/module

The hazard

A loss of anti-lock brakes and electronic stability control increases the risk of a crash or injury.

What to do

Dealers will inspect the rear brake modulator electrical connectors, install a protective cover, and replace the rear brake modulators, as necessary, free of charge. Owner notification letters were mailed June 8, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0494. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning April 30, 2026.