Toto Wolff admits there was a 'fine line' to call y urging Nico Rosberg to preserve his brakes, rather than attack Lewis Hamilton for the win in the Canadian Grand Prix.

The German was given repeated calls to manage his car due to concerns with the brakes on his Mercedes, particularly after last year's race, which saw both cars suffer a failure around the Circuit Gilles Villeneuve.

Indeed, though Rosberg would get as close as a second to his team-mate during the course of the race, he was urged to temper his push to catch Hamilton so as to ensure he had the brakes to fight ten laps from the end if he could.

Despite this, Wolff doesn't believe Rosberg was ultimately prevented from mounting a challenge because of its call from the pit wall, particularly after he suffered a wide moment when he attempt to push on.

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"It is always a balance," he said. "There is a fine line between not interfering in the racing, letting them fight it out, and trying to make sure the car survives.

"At one stage we had more than 30 seconds gap to Bottas and high brake temperatures and we were a bit marginal on fuel, so we discussed how to keep all those key parameters under control. It was a tense situation, but I wouldn't say it wasn't tenser than at other races.

"We wanted to help to manage the brakes so that the two of them could race each other with ten laps to the end. We gave them the call that brakes were looking okay and I think Nico realised that when he was pushing towards the end of the race that he missed the braking once and, with it being so difficult to overtake here, he probably realised it was going to be very hard to overtake unless Lewis made a mistake."