Championship leader Sebastian Vettel moved to the front during the final practice session for the Austrian Grand Prix while there was further drama for title rival Lewis Hamilton.
Vettel and Hamilton traded quick times at the head of the field in the 60-minute session, with one of the German’s flying laps affected when he encountered the Mercedes driver through Turn 7.
Vettel regrouped and ultimately overhauled Hamilton, registering a time of 1:05.092 to wind up 0.269s clear of the Briton.
Hamilton heads into qualifying with a five-place grid penalty due to an unscheduled gearbox change, but was hindered by another issue with 10 minutes remaining in the session when he suffered a brake disc failure.
As Hamilton braked for the uphill right-hander at Turn 3, a plume of black smoke poured from his front-right brakes, briefly pitching him sideways, before he ran straight on into the run-off.
Hamilton cruised back to the pits and Mercedes confirmed that he suffered a problem with the brake system, related to the team, rather than an issue with the components supplied.
The result was a disc failure, though not caused by an issue with the disc, and the relevant parts will be replaced prior to qualifying.
Hamilton’s Mercedes team-mate Valtteri Bottas was third fastest, with Ferrari's Kimi Räikkönen a tenth behind in fourth.
Red Bull finished fifth and sixth, Max Verstappen ahead of Daniel Ricciardo, as the pair slipped further back in terms of pace compared to Friday’s running.
Kevin Magnussen once again spearheaded the midfield battle for Haas, in front of team-mate Romain Grosjean, as the final drivers to finish within a second of Vettel.
Toro Rosso made progress after a tricky second session to record ninth and 10th, Daniil Kvyat quicker than Carlos Sainz Jr., who had stopped on track during the opening stages amid a suspected engine complaint.
Force India’s Esteban Ocon was 11th, ahead of Nico Hülkenberg and Stoffel Vandoorne, the only McLaren driver running Honda’s ‘Spec 3’ power unit after an issue was detected on Fernando Alonso's car.
Alonso wound up in 15th spot, behind Jolyon Palmer, but clear of Williams pair Lance Stroll and Felipe Massa, whose struggles continued.
Sergio Pérez was again off the pace, down in 18th position, as Sauber maintained its spot at the back of the field, Marcus Ericsson a tenth up on Pascal Wehrlein.
