Good morning everyone and welcome to live text commentary of the second free practice session ahead of the Chinese Grand Prix.

If you want to talk racing, why not join me, Mark Patterson on Twitter @Mark_Eurosport?

That concludes the action from practice for the day - we'll be back tomorrow at 4am UK time for free practice 3, with qualifying at 7am.

The top 10: Schumacher, Hamilton, Vettel, Webber, Rosberg, Button, Kobayashi, Di Resta, Hulkenberg, Alonso

Drivers are finishing their current laps and heading back in after a busy 90 minutes.

Either Raikkonen has more pace than his headline time suggests, or he's running very light on fuel - a 1:39.5 as the session draws to a close.

In comes Hamilton to end his session, while Button relays his struggle with the front wheels to his engineers - he too has struggled at turn 14 - another nasty lock-up.

That's a much better time from Schumacher - a 1:42.5. Button and Hamilton rattling along at a comparable pace.

Schumacher and Rosberg both do a quick stop in the pits to test the time-loss for the drivers when they make a stop. The Sunday strategy being considered from every imaginable angle.

Alonso, by contrast, lapping in and around 1:44 - a clear second and some adrift of the times we've seen from McLaren.

The only thing that you can say with any certainty is that the McLaren times are not showing any signs of a drop-off. That's encouraging for the British team.

The cameras trying to compare Button's lap with Vettel's, but given how long each driver has been out it's hard to draw any conclusions.

At last - the Red Bulls emerge. Time for around five laps before the session draws to a close.

A lock-up for Lewis going into turn one - the same point at which Glock lost his front wing - but the lap times are still relatively consistent.

Hamilton changes his nose cone, leaves his tyres as they were, and heads out again.

Webber now talking to Adrian Newey, Red Bull's chief engineer, rather than running any further laps.

Fuel loads and so on mean it's not an exact comparison, but it does bear out against some of the racing we've seen this season to date.

The McLarens are quicker though, much quicker. They're holding steady at around 1:43 per lap, while the Mercedes laps started at a similar level and subsequently dropped away to around 1:45 per lap.

Still no sign of the Red Bulls, but Schumacher and Rosberg powering along in their race simulations.

Perez has another huge lock-up on a new set of soft tyres - tough day to be a tyre on the Mexican's car.

The Top 10 with 15 minutes remaining: Schumacher, Hamilton, Vettel, Webber, Button, Kobayashi, Di Resta, Hulkenberg, Alonso