Valtteri Bottas set the pace on the second morning of in-season testing at the Bahrain International Circuit.
The T-wing fell off Valtteri Bottas's Mercedes in Friday's second practice and caused damage to the floor of Max Verstappen's vehicle when the Dutchman hit it with his Red Bull.
Valtteri Bottas topped the second and final day of Formula 1's first in-season test of the year in Bahrain for Mercedes, finishing nearly three-tenths of a second clear of Ferrari's Sebastian Vettel.
Kevin Magnussen finished fifth for Haas ahead of Force India's Esteban Ocon, who handed the VJM10 vehicle over to team-mate Sergio Perez for the afternoon.
Carlos Sainz was third during an afternoon of running for Toro Rosso, but it was Stoffel Vandoorne in fourth place who is likely to be the happiest of all 12 drivers to run on Wednesday. That led to an extended period of downtime in the garage as the team conducted a series of systems checks, but the vehicle reappeared in the early afternoon.
Williams test driver Gary Paffett made his return to F1 on Wednesday following a four-year absence from an official F1 test. His best lap was 1.386s off Bottas' fastest time and was enough to sit fifth in the timesheets after four and half hours of testing.
"We don't like that, at all", said motorsport boss Wolff. However, if the team can sync its mapping and brake-by-wire system with the Carbon Industrie brakes, they could be introduced as soon as the Russian Grand Prix next week.
Pierre Gasly is taking over for Red Bull, with Daniel Ricciardo's running on Tuesday having been cut short by an engine failure.
Sergey Sirotkin's first full day in the Renault R.S.17 auto saw him finish ninth with 90 laps to his name, while Pierre Gasly was P10 for Red Bull. Sauber's Pascal Wehrlein finished up 11th, chalking up another 91 laps as his push for full fitness continued.