Lewis Hamilton went from the top of the times in the first practice session to struggling in the second as track conditions changed in Korea.
Michael Schumacher has been handed his second reprimand of 2012 for impeding a rival during practice.
Charles Pic will become the first driver this year to incur a penalty for having an engine change.
Are Red Bull on course to repeat their 2011 triumph in Korea? Get your predictions in before qualifying – there’s prizes to be won!
Pictures from Friday practice for the Korean Grand Prix.
Lotus technical director James Allison says the team expect to use their new Coanda exhaust during the Korean Grand Prix having evaluated it during practice on Friday.
Sebastian Vettel led the second practice session in which Red Bull consistently had the quickest car.
Lewis Hamilton set the fastest time in first practice after Fernando Alonso led the way for most of the session.
In the round-up: Kobayashi’s seat under threat ?σΤιΌ?σ De Villota vows to ‘keep fighting for women in motor sport’ ?σΤιΌ?σ McLaren may get tax break on $100m fine
Follow the 2012 Korean Grand Prix second practice session on F1 Fanatic Live.