Mercedes' Ross Brawn says teams must trust the FIA to properly police F1

Just a week after an issue with Red Bull's engine maps in Hockenheim, it emerged in Hungary that the Milton Keynes-based outfit had been asked at the Canadian GP to modify a device that could have allowed the team to alter suspension settings manually - something that is against the regulations.

The latest row, which comes after issues with Red Bull's floor in Monaco and its wheel hubs in Canada, has further increased scrutiny on the team and led to questions about whether or not it is pushing the regulations too much.

But Brawn, whose own outfit was subject to an official protest by Lotus about the legality of its double DRS system earlier this year, says that teams like his have to simply rely on the FIA to ensure that nothing untoward is going on.

When asked ahead of the Hungarian Grand Prix if there were any designs out there that concerned him, he said: "Not that we are aware of.

"Obviously something has arisen that the FIA has had to deal with, and that is something the FIA needs to do.

"We are in their capable hands to make sure that the sport is regulated properly, but I don't know any of the details beyond what I have read on some of the websites. So it is really up to the FIA and the competitor to resolve."

Red Bull boss Christian Horner insisted on Saturday that his outfit had never made changes to its car's suspension manually, and had always used a tool as required by the rules.