| Date | Saturday February 21 2015 |
| Driver | Jenson Button |
| Location | Circuit de Barcelona-Catalunya (4.655km) |
| Laps/km | 24/111km |
| Best laptime | 1m29.151s |
Programme
A disappointing day. The damp weather pushed the emphasis onto aerodynamic testing, but this was cut short by a failure of the revised seal introduced today in a bid to resolve the week’s MGU-K issues.
To compound a tricky day, Jenson suffered a punctured Intermediate tyre during a practice pitstop, coming to a halt before the end of the pitlane.
JENSON BUTTON
“Yesterday wasn’t bad, with more mileage and lots of data gathered, but today’s been tricky – it hasn’t been my day. We had a similar problem to the one we faced on Thursday, with the faulty MGU-K seal, so the afternoon running was limited to aero testing and pitstop practice.
“I still can’t comment on where the car will be when everything is running smoothly, as I haven’t had the chance to run it properly without meeting problems. Having said that, I feel like there’s definitely nothing wrong with the car or any stand-out issues with driveability. You jump in the car and everything feels good.
“Hopefully, our problems will be solved sooner rather than later, but tomorrow is still likely to be a reasonably difficult day. There’s a lot for us to improve at the moment – we’ve still got five days of testing left, so hopefully they’ll be five good days.”
TODAY’S UNOFFICIAL TESTING TIMES
| 1 | Pastor Maldonado | Lotus | 1m24.348s | 104 laps |
| 2 | Max Verstappen | Toro Rosso | 1m24.739s | 129 laps |
| 3 | Lewis Hamilton | Mercedes | 1m26.076s | 101 laps |
| 4 | Marcus Eriksson | Sauber | 1m26.340s | 53 laps |
| 5 | Sebastian Vettel | Ferrari | 1m26.407s | 105 laps |
| 6 | Daniil Kvyat | Red Bull | 1m26.589s | 112 laps |
| 7 | Felipe Massa | Williams | 1m26.912s | 55 laps |
| 8 | Pascal Wehrlein | Force India | 1m27.333s | 81 laps |
| 9 | Valtteri Bottas | Williams | 1m27.556s | 49 laps |
| 10 | Jenson Button | McLaren-Honda | 1m29.151s | 24 laps |
What’s next
Final day of this test. Tomorrow, the team will try another fix to the on-going MGU-K issue. With the lack of mileage recorded so far this week, the programme for tomorrow remains relatively open-ended.
Test dates
Four days (February 19-22).