F1: Button says problems fixed

Brawn GP have worked out where they went wrong in the last three races and are ready to get back on top this weekend, Formula One championship leader Jenson Button said.

"I think we understand the car much better than we did one or two races ago," the Briton, who leads Red Bull's Mark Webber by 18.5 points with seven races remaining, told a news conference at the European Grand Prix in Valencia.

"It looks positive and we have got to hope when we get on to the circuit tomorrow that it feels positive and it is not just what we see in the data.

"We have made some steps forward since the last race and I think we have also looked at a few of the areas that we thought we had improved in over the last couple of races. We have looked at the possibility of going back on those changes."

Button won six of the first seven races of the season, after just one win in his previous 153 starts, but has struggled to get close to the podium in the last three, most recently finishing seventh in Hungary last month.

The Briton had blamed much of the car's performance on unusually cold temperatures affecting the tyres in his home race at Silverstone and then in Germany but that excuse rang hollow in the Budapest sunshine.

Tanned and rested after a three-week summer break, Button suggested the problems were more down to the team taking a wrong turning in their aerodynamic developments for the car.

"At every race you arrive at, you bring something new and you try something new, be it aerodynamics or mechanical set-up," he explained.

"There are lots of different things that you can try throughout the season and you have to do it at the races. And we know, we think we know, where we went wrong.

"You never know 100 percent, for sure... but we think we understand the car and the issues that we have and hopefully they will be solved at this race," he added.