Williams endured a challenging start to the Turkish Grand Prix weekend with both Rubens Barrichello and Pastor Maldonado suffering problems during Friday practice in Istanbul.

Maldonado went off in both sessions, damaging the rear of his car with an accident at the end of FP1 and then damaging the nose when he was caught out by a damp patch in the second session - meaning he will now be forced to use an old nose for the remainder of the weekend.

Barrichello meanwhile saw his time on track during the afternoon compromised by a KERS issue although technical director Sam Michael preferred to look to the positives as upgrades fitted to the FW33 led to an upturn in performance.

"This morning was wet so we didn't start our evaluation of new aero components until second practice," he said. "During that session we ran the new rear wing on Rubens' car and we were pleased to see that it functioned well, with a healthy gain in top speed and no signs of aero separation. We will have a second rear wing for Pastor's car tomorrow.

"We also ran a new rear brake duct and new front wings on both cars. All the data from those parts checked out well, with positive driver feedback. So we'll race everything this weekend. We also investigated a different mechanical set-up with Rubens.

"Unfortunately before we could run the soft tyre with Rubens we had a KERS water system failure and had to stop his car to investigate due to safety issues. We're looking into the problem now. We didn't use KERS all day on Pastor's car due to a voltage fault early in second practice. With the limited number of parts Pastor will also have to use the old front wing tomorrow after damaging his new front wing in second practice."



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