Lando Norris says both he and McLaren are not sure what caused the Briton's issues that put him out of the Canadian Grand Prix.
Norris was struggling with his brakes for a number of laps before he pulled over beside the pit exit on lap nine with right rear suspension damage.
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There was a small fire in the brakes of the MCL34, but Norris is baffled as to why the situation arose in the first place.
"We don't know yet until they get the car back, I can't say too much," he said. "There was a problem with the brakes, which led to something else happening. But I have no idea.
"It's annoying because up to then I had quite a fun battle with Max [Verstappen]. I would've liked to complete the race, but just not our day."
Norris insists that he stayed away from the walls and didn't make contact with them or take any of the kerbs abnormally to incur damage.
"I didn't hit any walls, I did everything normal. It looked like something to do with the suspension breaking or giving way. I can't confirm, I don't know what it is - neither do the guys.
"We need to get the car back and then we can investigate," the 2018 Formula 2 runner up concluded.
The retirement marks Norris' second in the last three races, with his last top ten finish coming at the Azerbaijan Grand Prix when he crossed the line in P8.
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Thoooose brakes are on fiiiireeeeeeeeee!