But team boss Brown is in positive spirits ahead of next year's challenge, though he did concede that Red Bull are the favourites to retain their crown.
"Well it's probably going to be Red Bull but I would not want to rule anybody else out," he told Sky Sports F1. "There’s a lot of great teams on the grid. We're feeling really good about our car for next year.
"[It's] hard to kind of know when Red Bull maybe stopped developing this year's car to get going on next year's. But we definitely feel like we will take a step forward but so will the entire grid and we’re just going to have to wait and see."
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