Coulthard fastest in wet Barcelona
The Scot's 1m21.066s lap was a new record for the revised Catalunya track, beating the mark set by Kimi Raikkonen on Monday.
Ferrari had dominated the first three days of the test, but had a less successful time today, with Felipe Massa's car requiring a tow back to the pits after encountering hydraulic problems this morning.
Massa rejoined later in the session, but was only third quickest, behind McLaren's Pedro de la Rosa, who also stopped with mechanical issues early on.
Pos Driver Team Time Laps
1. Coulthard Red Bull-Renault (B) 1:21.066 59
2. de la Rosa McLaren-Mercedes (B) 1:21.267 58
3. Massa Ferrari (B) 1:21.483 38
4. Fisichella Renault (B) 1:21.876 63
5. Kubica BMW-Sauber (B) 1:22.098 55
6. R.Schumacher Toyota (B) 1:22.359 49
7. Klien Honda (B) 1:22.807 80