National Highway Traffic Safety Administration's NHTSA Recalls [http://www-odi.nhtsa.dot.gov/cars/problems/recalls/] - The Recalls Search Engine enables you to search the database for recall campaigns concerning motor vehicles, child safety devices, tires, and related equipment.
The search engine allows you to retrieve information by the vehicle or equipment producer and/or model. Child safety seat recalls from 1990 to date, by manufacturer. Safety Recalls for all school buses from January 1997, updated annually. (Descriptions from the website here)