Sebastian Vettel admitted that it was good to get some more mileage under his belt on day two of the Bahrain F1 test, but revealed that Red Bull Racing was still dealing with a myriad of problems.

The German managed only 14 laps on the opening day in Sakhir, adding to the paltry 21 that RBR managed in total across four days at Jerez last month, but was able to rack up a further 59 tours of the Bahrain International Circuit on day two of the second pre-season session to more than double the team's data on the troubled RB10.

While the car is plagued by more than braking issues, Vettel admitted that they was among the list of gremlins still being pursued by the engineers as he hands over to team-mate Daniel Ricciardo for day three.

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"We did more laps today, so that's encouraging," the German reflected, "It was good to check the car, check the reliability, but there's a lot for us to do.

"We're still struggling on [the braking] front to be honest, so we still have some work to do there. It's not that easy to find an immediate fix but, as I said, today it was important to run - even if the laps weren't the quickest.

"I think the last two days are very useful - we've done more laps today than yesterday, and I hope Daniel will get more laps tomorrow. There's a lot of stuff to do, especially making sure everything speaks to each properly with the new power unit. We still have some things to sort out, and we've been very busy, both on the Renault side and the Red Bull side, but its good that we've done some running and got some more information so we've got more homework to do."

Admitting that it was difficult to say whether RBR had managed to close the gap on its rivals without knowing what the other teams were working on, Vettel conceded that, with the new technical regulations, the F1 landscape had shifted somewhat, with the engineers playing a bigger role, at least in the early part of the season.

"F1 has changed a lot," he smiled, "I think everybody can say that, with just a couple of days running, there's a lot of problems that occur which you need to understand before you can solve them."

Despite the issues, however, the four-time world champion insisted that he was not giving up on dreams of a fifth title, or even being at the front of the pack in Melbourne a month from now.

"There's no reason not to have faith," he claimed, "I think everyone wants to do better, but it's a bit difficult at this stage. There's no point talking about it that much. We know the problems, we're trying to understand all of them and then we'll try to fix them.

"It's a simple as that - it's difficult to give a forecast how tomorrow is going to be, how next week is going to be, so we just have to go step by step."