After waiting nearly three hours for Red Bull to hit the track, Daniel Ricciardo managed just half a lap before grinding to a halt at Jerez. Technical expert Gary Anderson looks at the problems the world champion squad is having.
The reason for the stoppage hasn't yet emerged, but this is worrying for Red Bull given that the new RB10 has managed a grand total of 11 complete laps in two and a half days.
The technical rumor mill in the paddock suggests that Renault is less than pleased with Red Bull's installation of the control electronics in its 2014 car. While this is just a rumor, Red Bull has done the fewest laps of any of the teams that has run so far, so it's clear something has gone wrong.
Changing an installation like this is not easy because there simply is not any spare space left over in a car, which means if this is at the root of the problem Red Bull will almost certainly have to make a fix work with what space it has. There will be a few sleepless nights for Red Bull before Bahrain, and Renault is also having its troubles, with all three of its cars struggling to string two laps together.
From the start of this test, Red Bull, Caterham and Scuderia Toro Rosso have managed only 68 laps between them as of 12:30 today.
Time to panic?
F1: Gary Anderson on Red Bull's troubles