Nico Rosberg says the brakes "are really on edge" after suffering a fire during practice for the Mexican Grand Prix.
During FP1, Rosberg ran wide at Turn 12 trying to overtake Sebastian Vettel and rejoined the circuit with his rear brakes on fire. After a spell in the pits, Rosberg was able to rejoin late in the session and went on to set the fastest time of FP2 in the afternoon.
Rosberg says teams are always trying to push the limits with their brake cooling but admits Mexico is proving a bigger test due to the altitude.
"It is a challenge, we are really on the edge here on the brakes," Rosberg said. "If you cool the brakes more you lose performance because you need to open up the car and you lose downforce, so you go slower.
"You always want to be on the edge and here specifically is quite difficult because we are quite high up – it is like a ski station in Europe! The air is very thin so it doesn’t flow very well through the car and down the straights there is no resistance. We had the Monaco rear wing on the car with full downforce but we are doing Monza speeds, so it is quite impressive."
While encountering issues during the day, Rosberg had time to form a positive opinion of the Mexico City circuit's layout.
"It is unique, very slippery because the asphalt is new. It is smooth and doesn’t have a lot of grip so we are sliding about a bit. It reminds me of my youth because the corners are tight, so it is a bit like a go-kart track, but it’s great to drive. Going through those two stadiums, one is a fake one, but one is a real baseball stadium… I think it is an awesome atmosphere."
AS IT HAPPENED: Mexican Grand Prix FP2
Eric Silbermann's Mexican grumpy preview
Technical analysis: United States
Click here for the F1 drivers' girlfriends gallery
Keep up to date with all the F1 news via Facebook and Twitter
Max Verstappen finally managed to conquer Singapore’s unforgiving streets, holding off Charles Leclerc to claim…
Lando Norris earned himself a hard-fought fourth place finish in the Singapore Grand Prix, yet…
Kimi Antonelli could be just one race away from a maiden Formula 1 world championship,…
Charles Leclerc says he threw everything he had at Max Verstappen under the Singapore lights,…
Max Verstappen is beginning to enjoy himself again, and his Formula 1’s rivals have every…
Lewis Hamilton has held his hands up after a strategic misjudgment wrecked his chances of…