2009 Formula One World Championship joined Brawn as a test driver. Force India joined Brawn GP in using the Mercedes engines by signing a five-year deal until 2013, having ended their previous supply contract from Ferrari. The retirement of Red Bull Racing driver David Coulthard led to the appointment of Sebastian Vettel as his replacement, who left the Scuderia Toro Rosso team after a successful previous season including winning the Italian Grand Prix. Toro Rosso, a team designed to develop new Formula One drivers, saw co-owner Gerhard Berger sell his half-stake back to Red Bull, claiming that the new regulations would "leave no room for
History of Formula One nothing they could do to enforce it. This led to an end to the ban on team orders for the 2011 Formula One season. Other changes included a re-introduction KERS, the introduction of the Drag reduction system (DRS) (a driver activated moveable flap on the cars rear wing), and a change in tyre supplier from Bridgestone to Pirelli. Vettel and Red Bull lead their respective championship from the start until the end of the season, dominating and taking their second successive titles. Vettel also became the youngest double world champion when he clinched the title at the 2011 Japanese Grand