Kimi Raikkonen has ended the second day of pre-season testing on top of the timesheets, setting a 1:17.091.
However, his day ended rather sourly as he caused the first red flag of the pre-season test with under 20 minutes left to run in the session,
His car ground to a halt as he approached Turn 9. The Iceman was the only driver to set a lap faster than Perez's, who second-placed time was clocked early in the morning.
While Perez's lap was set on the C3 compound, Raikkonen used the softest C5 tyre to complete his time.
The Silver Arrows revealed a new steering system, named the 'DAS' system, which allows the driver to control the toe angle with the steering wheel.
Lando Norris rounded out the top ten, closely followed by Romain Grosjean. The Frenchman was the first to make contact with the barriers, hitting the wall in the final hour at Turn 4 and suffering minor rear wing damage.
Bahrain International Circuit - Winter testing