WASHINGTON, D.C. --- Mack Trucks Inc. is recalling 921 MY 2008-2010 trucks because the National Highway Traffic Safety Administration has found that their air brake systems don't comply with federal safety standards. 

Dealers will rework the air brake system and make the necessary repairs free of charge. 

Mack Trucks can be reached at (800) 528-6586. (The recall number is SC0343.)