BERLIN, Germany - Former grand prix driver Ralf Schumacher hung up his helmet and moved into team management in 2013, only months after older brother and seven times world champion Michael retired from Formula 1.Mercedes said the Ralf had relinquished his seat in the DTM (German touring car) series for a new role as managing shareholder at RSC Mucke Motorsport where he will support young drivers.Ralf is Germany's third most successful Formula 1 driver, with six race wins, behind brother Michael and triple world champion Sebastian Vettel.'EXCITING CHALLENGE' AHEADHe said: "I've been thinking a great deal about my future during the last few weeks. I have reached the conclusion that I am better able to support the extensive changes at Mercedes-Benz with regard to the DTM in a management role than at the wheel."I am very grateful for more than two decades in professional motor racing and the last five years with Mercedes-Benz in the DTM. This represents an exciting challenge for me, helping the best young drivers with my know-how and expertise." Michael Schumacher, now 44, retired from Formula 1 at the end of 2012 after three comeback seasons with Mercedes. He won 91 races with Benetton and Ferrari.