The session ended under a red flag as Ralph Boschung stopped on the circuit with four minutes to go, causing race control to suspend the session and instruct the cars to return to the pit lane.
Boschung's teammate Giuliano Alesi also had trouble as he spun before Turn 11, but managed to avoid hitting the barrier.
Mick Schumacher also ended the session earlier as he found himself facing the wrong way on the exit of Turn 16, stalling the car in doing so.
Bahrain International Circuit - Winter testing
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