Sebastian Vettel led a Red Bull one-two in the second practice session at the Circuit of the Americas.
Heikki Kovalainen was next, ending his first day of running for Lotus in fifth place. The two Sauber drivers separated him from team mate Romain Grosjean.
McLaren were the fifth-fastest team courtesy of Jenson Button while Fernando Alonso could only manage tenth for Ferrari, over a second off Vettel’s pace.
Several drivers reported poor grip during the session. Daniel Ricciardo complained of traction problems at turn one and Paul di Resta said his car’s grip level was “absolutely shocking”.
Pastor Maldonado was especially blunt with Williams, who he will be leaving at the end of the year. Asked to give his comments on the FW35 halfway through the session he simply replied “everything is wrong”.
For the second session in a row a Marussia driver came to grief in the final ten minutes. This time it was Max Chilton, who spun off at the final corner.
“I just had complete brake failure,” he said, “the pedal went completely to the floor”. He had described a brake problem earlier in the session but the team weren’t able to pinpoint it on their telemetry.
The marshals took several minutes to recover Chilton’s car, causing some frustration among the drivers still circulating. “Jesus, how long do they need to get that car away?” asked an exasperated Hulkenberg. The Marussia was eventually moved clear moments before the chequered flag came out.
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