Kobayashi says Sauber’s struggle began at Silverstone.
Sauber held on to seventh in the constructors’ championship.
Pictures from Thursday at Interlagos including Kamui Kobayashi’s special helmet design.
Kamui Kobayashi scored his first point since the German Grand Prix.
Sergio Perez claimed a point despite a penalty, while Kamui Kobayashi collided with Timo Glock.