Sebastien Buemi was left 'extremely disappointed' following practice for the Chinese Grand Prix on Friday, after he crashed out a high speed when both of his front wheels parted company with his car.

Buemi had already missed much of FP1 due to brake problems on his STR5, and had only completed five timed laps when, approaching the hairpin on the back straight with ten minutes remaining, he lost control when he suddenly found he only had two wheels.

Although he escaped unhurt and soon extract himself from the remains of his car, he was frustrated to have lost out on so much time behind the wheel.

"There's not much to say about what happened in FP1. I braked, the wheels came off and that was it," he said matter-of-factly. "Physically, I was fine though.

"But I have to say, I am extremely disappointed that, once again, through no fault of my own, I have been unable to run for almost all of the three hours available. I will have to try and catch up on Saturday morning and we will be relying on Jaime [Alguersuari]'s data from today to see which way to go."

Scuderia Toro Rosso soon identified the problem and confirmed that a new upright was to blame: "Sebastien's accident this morning was down to a technical problem on the right hand upright, which proved simple to identify once we got the car back. We have resolved the problem, which the many laps completed by Jaime this afternoon confirms," explained technical director Giorgio Ascanelli.

"Apart from the upright, the accident caused some damage to the gearbox and a combination of fixing this problem and changing the front end meant that, despite the best efforts of the mechanics, we could not get Seb out before the end of the day.

"Fortunately though, Jaime did a lot of laps in a trouble free session, after we had stopped him as a precaution towards the end of FP1, until we had identified the problem on his team mate's car."

Meanwhile Alguersuari, in stark contrast to Buemi, was pleased with his day's work and while he had never driven at the Shanghai International Circuit before he still ran competitively, ending FP1 in eleventh and FP2 in eighth.

"Another new circuit for me: it's impressive, tough and technical but enjoyable to drive. Today went well for me, as we completed a lot of work, trying different fuel loads and working on set up, as well as a tyre comparison. The hard tyre definitely takes a lot longer to come up to temperature, while the soft tyre seemed to work very well for us and should be good in the race. We still have work to do to improve tomorrow, but I am happy with what we have achieved so far," he summed-up.