A broken rear roll-bar was the cause of Sebastian Vettel's problems in final qualifying for the Turkish Grand Prix, Red Bull Racing has discovered.
Vettel complained of a locking front left brake in the Q3 session - which cost him any chance of beating team-mate Mark Webber to the pole position.
And although it was suspected the issue could be a repeat of the brake problems that he suffered in Spain, investigations by Red Bull Racing have uncovered another part of the car was to blame.
Team principal Christian Horner said: "It looks like it was the roll-bar linkage. With no control over the roll of the car, as soon you turn in the car just rolls over. So he just locked the inside front wheel as it stuck up in the air."
Although parc ferme regulations mean that the team cannot touch the car tonight to make any change, Red Bull will be able to replace any broken parts on Sunday morning.
Horner also said that the set of tyres Vettel will have to start on did not suffer any flat spots when he locked up.
"We cannot see any damage," he said.
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