Welcome to LIVE coverage of the second free practice for the Brazilian GP from Interlagos.

And that's the end of that. Red Bull's day - but will it be the same story tomorrow? Join us at 1pm and 4pm to find out.

How they stand: 1-Vettel, 2-Webber, 3-Alonso, 4-Hamilton, 5-Massa, 6-Kubica, 7-Button, 8-Heidfeld, 9-Rosberg, 10-Schumacher, 11-Barrichello, 12-Kobayashi, 13-Hulkenberg, 14-Sutil, 15-Petrov.

23 or 24 cars are still out - Lucas Di Grassi the exception - but the heavy fuel loads mean the standings are unlikely to change.

Both Red Bulls are now out with high fuel loads, so they will not improve on their best times. Most drivers have gone back to regular tyres after a blast on the super-softs.

While there's a bit of a lull, I'll draw your attention to live coverage of the final free practice session at 1pm tomorrow and qualifying at 4pm.

Jarno Trulli is the 'lappingest' man on track - he has completed 36 circuits. Petrov has just 17 to his name.

Quick lap from Vettel, who nails a 1:11.968, the fastest of the day so far.

Jenson Button has promised he will do "the right thing" for McLaren this weekend. Whatever that may be...

Webber improves to 1:12.072, while Alonso goes second with 1:12.328. Massa's session is over.

Marshals are out and they push Massa's car to safety. Sounds like a gearbox or driveshaft problem. At least it's not an engine issue.

Yellow flag as Massa grinds to a halt... what is the problem there?

Massa, Webber and Hamilton are all out on option tyres - we might see some real qualifying pace here.

Lewis Hamilton tells the McLrane pit crew he is happy with changes that have been made to the setup since this morning. Not sure what those changes are, mind.

All of this could be rendered pointless if, as expected, we get rain over the weekend.

Petrov is all over the the place but he still improves to 13th place.

A few of the teams are having a go with the softer 'option' tyre - Petrov and the two Toto Rossos are on out laps.

How they stand halfway through the session: 1-Webber 1:12.387, 2-Vettel, 3-Hamilton, 4-Massa, 5-Button, 6-Alonso, 7-Kubica, 8-Schumacher, 9-Rosberg, 10-Barrichello.

Air temperature is 30C, track temperature 40C, with an 8.2mps wind from the north. But clouds are starting to gather.

Lewis Hamilton has come into the pits with slightly grubby tyres, suggesting he has had a minor off.

Jaime Alguersuari tells his pit crew in very detailed fashion about the difficulty he faces taming his Toro Rosso.