Sebastian Vettel says a brake bias problem was behind a wild high-speed spin to the gravel trap towards the end of second free practice for the Austrian Grand Prix.

The German ended the weather-affected session in the gravel trap at the turn two hairpin after his Ferrari snapped into a spin at high-speed on braking.

Avoiding damage to his Ferrari SF16-T, Vettel - who will take a five-place grid penalty after suffering a gearbox change - ended the day fourth quickest, a result he was satisfied with given the rain and alarming conclusion.

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"We had an issue with the brake distribution. It caught me by surprise, but it didn't matter too much and fortunately nothing happened. I lost a couple of minutes, so it didn't make a big difference.

"I think it was a decent day. Obviously with the weather in the afternoon it was the same for everyone, but overall it was decent. The car feels good, it feels OK."

Despite the grid penalty, Vettel says he isn't ruling himself out of the lead fight, even if he admits he isn't sure how Ferrari is faring against the opposition just yet.

"I think every race is an opportunity. It was a decent day, but I'm not entirely clear where we are because we didn't get much running, in the afternoon in particular, but overall it should be okay."