Paul di Resta said he felt positive about the opening day of running in Abu Dhabi, despite suffering brake problems in second practice at Yas Marina.

The Force India man was one of two drivers to have problems in the second session, with a failure on the front left costing him time on track while repairs were carried out.

Despite that, the Scot was 13th quickest on the times and said it had been a solid start to proceedings.

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"It's been quite a positive day," he said. "The general balance is not too bad, although there's still work to do to improve the car through the high-speed part of the lap. The main issue of the afternoon was the brake failure on the front left, which caused me to run wide at turn eight. The team chose to change the brake material, which cost us about 15 minutes of track time, but we were able to do a long run on the soft tyre at the end of the session."

Team-mate Adrian Sutil meanwhile was 15th quickest having taken over from test driver James Calado for the second session, although the German admitted he was struggling to get the most out of the medium compound tyres.

"It's hard to say too much about today because we had to change the brake material in the middle of the second session," he said. "That had quite a big impact on the car and it was difficult to make a comparison with the set-up changes. There is quite a big difference between the two tyre compounds and at the moment I'm struggling more with the medium tyres. The general balance of the car felt okay so I'm still positive we can be in good shape tomorrow."