| Date | Thursday February 26 2015 |
| Driver | Jenson Button |
| Location | Circuit de Barcelona-Catalunya (4.655km) |
| Laps/km | 7/33km |
| Best laptime | 1m31.479s |
Programme
The day kicked off with Jenson conducting some aerodynamic tests, which meant he only completed a single timed lap.
After just seven laps, Jenson noted a vibration and brought the car back to the pits, where we discovered a hydraulic leak that required a full power-unit change. The time required to complete the change unfortunately meant that our running for the day was over before lunchtime.
TODAY’S UNOFFICIAL TESTING TIMES
| 1 | Felipe Massa | Williams | 1m23.500s | 103 laps |
| 2 | Marcus Ericsson | Sauber | 1m24.276s | 122 laps |
| 3 | Lewis Hamilton | Mercedes | 1m24.881s | 48 laps |
| 4 | Daniil Kvyat | Red Bull | 1m25.947s | 75 laps |
| 5 | Romain Grosjean | Lotus | 1m26.177s | 75 laps |
| 6 | Kimi Raikkonen | Ferrari | 1m26.327s | 80 laps |
| 7 | Carlos Sainz Jnr | Toro Rosso | 1m26.962s | 86 laps |
| 8 | Jenson Button | McLaren-Honda | 1m31.479s | 7 laps |
What’s next
Jenson resumes testing duties again tomorrow.
Test dates
Four days (February 26 – March 1).