JEREZ DE LA FRONTERA, Spain, Jan 16, 2008 (AFP) - German Timo Glock set the fastest time in his Toyota on the third day of Formula One testing here on Wednesday as the new Red Bull RB4 of David Coulthard broke down on its debut.

The session had to be interrupted five minutes before the scheduled finish to clear the RB4 from the track after it suffered mechanical problems shortly after being unveiled before the public.

Glock had the fastest lap of 1min 19.799sec ahead of McLaren´s Lewis Hamilton and Spain´s two-time world champion Fernando Alonso of Renault, who set the fastest time on Tuesday.

Red Bull on Wednesday presented their new test driver, 19-year-old Swiss Sebastien Buemi, the reserve for Scot Coulthard and Australian Mark Webber.

Leading times from Wednesday:

. Timo Glock (GER/Toyota) 1:19.799 (96 laps)

. Lewis Hamilton (GBR/McLaren) 1:20.099 (73)

. Fernando Alonso (ESP/Renault) 1:20.363 (49)

. Sebastien Bourdais (FRA/Toro Rosso) 1:20.407 (61)

. Felipe Massa (BRA/Ferrari) 1:20.500 (85)

. Heikki Kovalainen (FIN/McLaren) 1:20.535 (79)

. Kamui Kobayashi (JPN/Toyota) 1:20.577 (53)

. Kimi Raikkonen (FIN/Ferrari) 1:20.646 (88)

. Kazuki Nakajima (JPN/Williams) 1:20.758 (57)

. Adrian Sutil (GER/Force India) 1:21.705 (71)

. Mark Webber (AUS/Red Bull) 1:22.275 (53)

. David Coulthard (GBR/Red Bull) 1:22.581 (54)