Brazilian Grand Prix Friday quotes: Sauber

Sergio Perez - 13th: "I was on a long run with heavy fuel and the soft tyres when a gearbox problem stopped me. It is a shame I could not complete the run. With lower fuel the car was quite okay on the soft tyres. However, we still have some work to do for our qualifying performance. Force India looks strong here, but the cars from Renault and Toro Rosso look reachable."

Nov 25, 2011, 7:28 PM

Kamui Kobayashi - 14th: "I have done a lot of laps today. Actually the degradation is quite high with both tyre compounds, which would be tough in the race if the temperatures stay like today. But there is also a chance of rain. I had no problems with the car but we are working on improving the balance, which isn't quite right yet."

Giampaolo Dall'Ara, Head of Track Engineering: "In the morning we concentrated mainly on the set-up of the car using the two sets of test tyres Pirelli have provided for this event. In the afternoon our main focus was on the race preparation. We only used the compounds that are allocated for the weekend, which are soft and medium. We made a tyre comparison, which included runs with high fuel loads. Unfortunately Sergio had to stop early due to a gearbox problem."