Kimi Raikkonen said a visor tear-off got stuck in his Alfa Romeo’s brake duct, forcing him into an unscheduled pit stop.
However, he was the first to pit with only 12 laps completed, a stop which was not part of the plan.
“I think we had a small brake cooling [problem],” he told reporters in Melbourne.
“One of the tear-offs fell in so we had to stop earlier than we wanted.
“The car had a lot of speed in my view, but it is still difficult to overtake here.
“It is easier to get closer but the last push is still tricky in this circuit.”
Asked if his race with Alfa was everything he had hoped for, Raikkonen replied: “Not all, but I think we will take it.
“I’m happy how the car felt but generally if we would have tidied up a few things we could have got more.
“But for the first weekend with the team, I will take it. No major f*** ups – so we take it and try to make the car faster for the next one.”
Raikkonen’s rookie team-mate Antonio Giovinazzi finished all the way down in P15.