(CNN) -- The Red Bull pairing of Sebastian Vettel and Mark Webber set the fastest times in Friday's practice for the Brazilian Grand Prix at Interlagos, as they try to put in-fighting behind them and get their respective world championship bids back on track.
Vettel, currently fourth in this season's standings, clocked the fastest lap time, 0.482 seconds faster than his Australian colleague, with the Red Bull team looking to make amends for a disastrous weekend in Korea a fortnight ago, when both men were forced to retire from the race.
The times gave Red Bull a timely boost, on a day when Webber publicly accused his team of showing preferential treatment towards Vettel in the race for the sport's top prize.
Meanwhile, championship leader Fernando Alonso -- who holds an 11-point advantage over second-placed Webber in the driver's table -- was languishing in 13th place after he suffered an engine failure, at the start of a weekend which could see the Ferrari driver claim his third world title.
It proved a frustrating end to the session for Alonso, who has shot to the top of the leader board with three wins in the last four races.
His teammate Felipe Massa, who has won on the last two occasions at his home grand prix at Interlagos, also struggled and could only record the 14th fastest time.
McLaren's British pairing of Lewis Hamilton and Jenson Button complete the quintet of driver's championship hopefuls, with Hamilton recording the third-fastest lap and reigning champion Button hot on his heels in fourth place.
Fellow-Brazilian Rubens Barrichello enjoyed more success on home soil, finishing the session a respectable seventh in his Williams.
Qualifying for Sunday's grand prix in Sao Paolo will take place on Saturday afternoon.