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BARCELONA - Brawn GP remain the team to beat after Jenson Button's fourth victory in five races, but there are signs of discord after a threat by teammate Rubens Barrichello to quit Formula One if team orders come into play.
The Brazilian said in an interview he would quit if he believed championship leader Button was being favoured by the team.
"If I get the slightest sniff of the fact that they have favoured Jenson, I will hang up my helmet tomorrow," he said.
Button won the Spanish Grand Prix ahead of the Brazilian Grand Prix on Sunday, making it four victories in the first five races, to extend his lead at the top of the drivers' championship.
Button's victory came after team boss Ross Brawn reduced his planned pit stops from three to two. He made the most of the switch to win the race and move to 41 points in the standings, ahead of Barrichello (27) and Germany's Sebastian Vettel (23) in a Red Bull.
Barrichello was number two behind Michael Schumacher at Ferrari when Brawn was technical director - and suffered from team orders that prevented him from racing the German.
"I have had experience of that and if it happens I won't follow any team orders," said Barrichello, who left Ferrari in 2005. - Sapa-DPA