Lewis Hamilton says his struggles with the Mercedes remain a work in progress despite a strong showing in the Canadian Grand Prix.
The Briton admitted he does not feel confident enough with the braking of his car, and is still trying to find a solution that allows him to extract the best from it.
Hamilton finished in third place in Montreal, clearly ahead of team-mate Nico Rosberg.
The 2008 champion insisted, however, that he still has not solved his issues.
"It has just been a work in progress," said Hamilton, who lost out in his battle with Fernando Alonso. "We haven't cured anything. It has been a long period of time since Barcelona where there was big trouble there.
"We have picked up a couple of techniques and worked on it, which helps.
"We still need to improve [the braking] and that is where Fernando was catching me everywhere.
"He was massively quick and difficult to keep behind. I tried my best and got closer once he got behind me, but he was too quick."
Apart from the problems with the braking, Hamilton admitted his car felt like it was lacking grip during the race.
"I guess it was just grip, as the car was pretty fantastic," he said.
"I am assuming those guys were better with that. Fernando seemed to be quicker in the lower speed corners."