Melbourne - Mercedes motorsport director Norbert Haug has spoken out against the uncertainty of the new rule changes in Formula One in the wake of Brawn GP's imperious one-two victory in Sunday's season-opening Australian Grand Prix in Melbourne.

Jenson Button took the chequered flag ahead of team-mate Rubens Barrichello but Ferrari, Renault and Red Bull have all protested the decision by the race commissioners at Albert Park to allow Honda's successor team, as well as Williams and Toyota, to field new diffusers.

The protesting teams said the new diffusers, a part of the car that improves its aerodynamic performance, give their rivals an unfair advantage and break racing regulations.

"There needs to be clear rules, that has to be the target," Haug said in a telephone interview.

"The two-class structure is not good. It's not good in any sport."

Haug added that McLaren-Mercedes would be prepared for whatever decision motorsport's ruling body FIA makes when its appeal board hears the case on April 14 in Paris.

However, any decision will come too late for Sunday's Malaysian GP in Sepang and Haug said he didn't expect world champion Lewis Hamilton to be able to repeat his feat in Australia of making the podium and that Brawn and Button could pull even further away.

"I don't believe he drove as fast as he can," Haug said of Button. (dpa)