Felipe Nasr has rated his Mexican Grand Prix as a 'tough' learning experience after he was forced to retire due to a major brake problem.

Both Sauber cars had been struggling to cool its brakes at the Autodromo Hermanos Rodriguez due to the lack of air at the highest altitude of the season. The Brazilian driver says he had no option but to retire his car after feeling his brakes completely let go.

After a dressing down from team principal Monisha Kaltenborn because of the collision with his team-mate Marcus Ericsson the week before at the US GP, Nasr was determined to make amends in Mexico and says he did his best to save his brakes before the situation turned dangerous.

"It was a tough race," Nasr said. "I was not able to finish the race due to brake issues. I did my best to manage them, but they got to a critical point. I had to stop the car in Turn 13. It is a shame, not only for myself, but also for the team as we all lose together. We need to find a solution for this issue."

Kaltenborn accepted it was a tricky race for Sauber with its brake cooling problems and hopes the team find a solution to prevent a repeat situation.

"We knew that the race would be difficult, as expected, the brakes were the major challenge," Kaltenborn confirmed. "Both drivers did their best, but, unfortunately, Felipe was not able to finish the race, whereas Marcus managed the situation well. However, his performance remains unrewarded finishing in 12th."

Nasr's failure in Mexico was the first time the F1 rookie hasn't been able to secure a classified finish in 2015, with the exception of British Grand Prix where he failed to make the start of the race.

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