PACCAR issued a recall on the C500 model

On certain vehicles maneuvered with certain combinations of wheel turn, articulation and bump, the brake chamber can contact the rear hood support. The contact can damage the brake chamber leading to a loss of braking function at the affected wheel end. This could lead to a crash causing property damage, personal injury or death. Correction: Dealers will replace or modify the rear hood support with a larger cutout. Brake chambers will be inspected for damage, and replaced if any exists.