Lance Stroll faces a difficult United States Grand Prix weekend after his practice session was curtailed by a brake problem on his Aston Martin.
The Canadian enters the weekend under pressure after another disappointing event at the Qatar Grand Prix continued his poor form since the summer break.
His off-track antics drew criticism after a short, sharp interview followed a push on his trainer but any chance of putting those wrongs right took a hit as brake temperature fears prompted an early return to the garage at the Circuit of the Americas.
Stroll will enter qualifying on the back of only two laps after the issue, leaving him likely to face a fifth Q1 elimination in a row, with the complications of F1's Sprint format coming back to bite.
Teammate Fernando Alonso also spent time in the garage as his mechanics checked whether he was facing a similar issue, though the two-time World Champion did return to the circuit.