- Lewis Hamilton said his early-race battle with Mercedes team-mate Nico Rosberg led to the brake problems that ended his Canadian Grand Prix.
Hamilton and Rosberg were locked in a fight for the lead until they both began to suffer from Energy Recovery System problems.
Australian Daniel Ricciardo claimed his maiden victory for Red Bull when he passed the ailing Rosberg late in the race.
"I was following (Rosberg) and when you're following someone you're gaining more heat," said Hamilton. "He was in clean air.
"There was not much I could do. When I came out in front, everything was cooked already."
Hamilton had got ahead of Rosberg after the first round of pit stops.
"I got him in the stop, " Hamilton added. "Then straight away on that lap the brakes failed."