May 30 (GMM) Red Bull have identified a broken roll-bar as the reason for Sebastian Vettel's lack of pace during Q3 in Turkey.

Germany's Auto Motor und Sport said it was "der Stabilisator" (the roll-bar) that meant the RB6's front wheels locked, preventing him from replicating his fastest pace of Q1 and Q2.

Unlike general setup changes, or changes to the engine or gearbox, the Austrian team is able to replace the roll-bar before the race without incurring a penalty.

The 22-year-old will start the Istanbul Park race from third on the grid, but he was visibly disappointed at missing out on pole.

"We are on the clean side (of the grid), so let's see, it's a long race. But with this year's regulations and no more fuel pit stops it is a bit difficult to make up places," said Vettel.

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