Sebastian Vettel says a problem with his brake bias triggered his exit from the second practice session at the Austrian Grand Prix.
Vettel locked the rears under braking for Turn 2 and spun at high speed, sliding through the gravel trap before coming to a halt, avoiding contact with the barriers in the process.
Vettel, whose incident came during the closing stages, placed fourth during a session affected by wet weather at the Red Bull Ring.
Vettel had been third quickest during the completely dry first practice session, behind Mercedes duo Nico Rosberg and Lewis Hamilton.
"We had an issue with the brake distribution," Vettel said shortly after the incident.
"It caught me by surprise. But it didn't matter too much.
"Every race is an opportunity. It was a decent day. It's not entirely clear where we are, as there was not much running. But it's looking OK."
Vettel finished last year's Austrian Grand Prix in fourth position.