United States GP: Sebastian Vettel on top in second practice

Sebastian Vettel tops the timings in Texas as he pips team-mate Mark Webber by 0.115 seconds in second practice for the United States Grand Prix.

Mercedes' Nico Rosberg is third from team-mate Lewis Hamilton, while Britain's Max Chilton spins out in his Marussia late on after suffering brake failure.

Vettel nearly a second a lap faster than the best driver from any other team during the race-simulation runs in the final part of the session, with Webber a few tenths of a second behind his team-mate.

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