Red Bull Racing rolled out their 2008 challenger on Wednesday morning. The RB4, to be raced by David Coulthard and Mark Webber this season, was presented to the media in the Jerez pit lane ahead of its maiden test at the Spanish circuit.

The Renault-powered machine is the second car designed for the team under the technical leadership of Adrian Newey. With it Red Bull hope to solve the reliability problems they experienced with its predecessor and build on the fifth place they achieved in the 2007 constructors' championship.

"For the first time in our short history, there is continuity within the design group, with our engine partner and with the drivers," Red Bull team principal Christian Horner told Formula1.com recently. "The RB4 will be an evolution of the RB3, which showed good pace during the season, especially in the final three races."

"In 2007 we gave away approximately 24 points as a result of poor reliability, without which we would have been much closer to Renault and ahead of Williams. This is therefore one of our key focuses for 2008."