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.

"The chassis change has paid off, if only they had changed this braking part too," Niki Lauda said wryly to Motorsport-Magazin.com after qualifying.

The problem translated to a half-second deficit to Webber for Vettel, allowing McLaren's Lewis Hamilton to slip between them on the grid.

"It was a tight fight with all of us and I think Seb had a bit of a problem with his car," admitted Australian afterwards.

The disappointment clearly told on 22-year-old Vettel's face, having come so close to bouncing back to top form after two races clearly behind his teammate.

"It should easily have been a lot quicker," said the German. "I'm not the type of guy who says 'the car is broken, that's it'."

Red Bull advisor Helmut Marko described Vettel's problem as a "pity", but for the energy drinks brand, its run of pole positions in 2010 remains unbroken.

"One and three is not so bad," said the Austrian Marko.

FULL RESULTS

Pos

Driver

Team

Q1

Q2

Q3

1

Mark Webber

RBR-Renault

1:27.500

1:26.818

1:26.295

2

Lewis Hamilton

McLaren-Mercedes

1:27.667

1:27.013

1:26.433

3

Sebastian Vettel

RBR-Renault

1:27.067

1:26.729

1:26.760

4

Jenson Button

McLaren-Mercedes

1:27.555

1:27.277

1:26.781

5

Michael Schumacher

Mercedes GP

1:27.756

1:27.438

1:26.857

6

Nico Rosberg

Mercedes GP

1:27.649

1:27.141

1:26.952

7

Robert Kubica

Renault

1:27.766

1:27.426

1:27.039

8

Felipe Massa

Ferrari

1:27.993

1:27.200

1:27.082

9

Vitaly Petrov

Renault

1:27.620

1:27.387

1:27.430

10

Kamui Kobayashi

BMW Sauber-Ferrari

1:28.158

1:27.434

1:28.122

11

Adrian Sutil

Force India-Mercedes

1:27.951

1:27.525

 

12

Fernando Alonso

Ferrari

1:27.857

1:27.612

 

13

Pedro de la Rosa

BMW Sauber-Ferrari

1:28.147

1:27.879

 

14

Sebastien Buemi

STR-Ferrari

1:28.534

1:28.273

 

15

Rubens Barrichello

Williams-Cosworth

1:28.336

1:28.392

 

16

Jaime Alguersuari

STR-Ferrari

1:28.460

1:28.540

 

17

Nico Hulkenberg

Williams-Cosworth

1:28.227

1:28.841

 

18

Vitantonio Liuzzi

Force India-Mercedes

1:28.958

 

 

19

Jarno Trulli

Lotus-Cosworth

1:30.237

 

 

20

Heikki Kovalainen

Lotus-Cosworth

1:30.519

 

 

21

Timo Glock

Virgin-Cosworth

1:30.744

 

 

22

Bruno Senna

HRT-Cosworth

1:31.266

 

 

23

Lucas di Grassi

Virgin-Cosworth

1:31.989

 

 

24

Karun Chandhok

HRT-Cosworth

1:32.060

 

 

2010 Turkish Grand Prix qualifying - RESULTS