• Australian GP - Mercedes

'Everything is on the edge' - Rosberg

ESPN Staff
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Nico Rosberg says there are several things that are still "on the edge" for Mercedes ahead of the first grand prix of the season in Australia, including fuel consumption and his car's brake-by-wire system.

Mercedes' two cars topped the second practice session for the Australian Grand Prix on Friday and also looked quick over long runs. But Rosberg said Mercedes still has issues, especially after team-mate Lewis Hamilton stopped after just half a lap with a sensor problem in FP1.

"I'm still optimistic for the weekend, but everything is on the edge," he said. "Reliability: as we saw for my team-mate stopping on track. Fuel consumption: massively tough because this is one of the toughest tracks for that. Every lap I can see where I am and where I should be and it was really, really difficult, so that is going to be a big challenge for Sunday. That is why Saturday qualifying is going to be a totally different story to Sunday's race.

"Our focus needs to be on the race because there is a lot of tyre degradation still, which we didn't expect so much, but it's just like last year. It's probably because we have less grip and we are spinning the tyres a lot more."

Rosberg said the brake-by-wire system on the rear axle, which all teams are running this year due to the beefed up kinetic energy recovery systems on the cars, is also still causing issues.

"We've been struggling, it's been going a bit on and off. It's all settings and then you get to an area where you haven't been before because you're running the brake balance differently and the rear steps out because there is some problem we hadn't seen yet. It's really delicate because the brake-by-wire is my braking for the rear axle and if I lock too much I'm off the track. It's tough."

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