Brawn GP was a Formula One constructor which competed in the 2009 Formula One World Championship, with drivers Jenson Button and Rubens Barrichello. The team was formed in 2009 by a management buyout led by Ross Brawn of the Honda Racing F1 Team, after Honda announced their withdrawal from the sport in December 2008 due to the 2008 financial crisis. The team started development of their car in early 2008, when still owned by Honda. For the 2009 season, Honda provided a $100 million budget, while Mercedes provided engines under a customer relationship.