BARCELONA, Spain (AP) - Rubens Barrichello made it clear to Brawn GP on Sunday that he will not willingly play second fiddle to teammate Jenson Button, after a strategy change at the Spanish Grand Prix may have cost him victory in favour of the championship leader.

Barrichello, who spent much of his career in a supporting role to Michael Schumacher at Ferrari, started third with Button in pole position, but overtook Sebastian Vettel and his teammate at the start to lead going into the first turn.

Brawn then changed its pit strategy for Button from three stops to two, which paid off for the Briton.

Button won for the fourth time in five races this season to extend his overall championship lead to 14 points over Barrichello.

Barrichello was asked if he would ever repeat what happened at the 2002 Austrian GP, when he followed Ferrari team orders and allowed Schumacher to pass on the final straight for a victory that helped him in his championship bid.

"If that happens I won't follow any team orders any more," Barrichello said. "I'm making it clear now so everyone knows."

Button was quick to point out that he believed Barrichello had the better strategy.

"Our strategy said that a three-stop was quicker - full stop," Button underlined. "I don't ever want to go down that avenue."

Barrichello was puzzled why the team made the decision.

"I had the race in my hands and I was quite surprised when they told me they were switching Jenson to two (stops)," Barrichello said. "I would like to understand why they changed that."

Barrichello started well but then said he could barely keep the car on the Circuit de Catalunya track over the last stint as Button pulled away for a 13-second win.

"My third set of tires was not good ... I couldn't keep my pace up. From there on it was a struggle, a big struggle to keep the car on the track," said Barrichello, whose last race win came at the Chinese GP in 2004. "The race was finished and that's the way it went. There's no way I'm going to sit here crying over this or that."

Button said it was frustrating to hear such questions.

"We both work very closely together within the team, and it's a very good atmosphere in the team. We are all here to win, and today it just went my way and it didn't for him," the Briton said. "It could swing around for the next race, that's the way things go in F1."