Car problem prevented Vettel pole in Turkey

A car defect has prevented Sebastian Vettel from scoring pole position for the Turkish grand prix.

Instead, his on-form Red Bull teammate Mark Webber netted his third consecutive qualifying triumph, and on Sunday could complete a hat-trick of wins from pole.

But Vettel, with his new 'Randy Mandy' chassis at Istanbul Park, was actually quicker in Q1 and Q2, and on course for a much faster lap when his front wheel began locking under braking.