Teams were putting in the final preparations for the British Grand Prix qualifying later this afternoon when Hartley was involved in a horrifying moment.
The Toro Rosso driver was on a flying lap approaching Brooklands - Silverstone's Turn 6 - when his left-front suspension spectacularly failed when he hit the brakes.
The vehicle came back down enough to ensure Hartley did not go over the barrier, with the nose of the Toro Rosso being buried in the tire barrier as it came to an abrupt stop.
The front-left suspension of Hartley's vehicle failed spectacularly as he approached the braking zone for Brooklands corner, which sits at the end of one of Silverstone's long straights.
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Haas's Romain Grosjean and Red Bull's Max Verstappen were other two drivers who crashed during the practice session on Friday.
"What a scary experience for Brendon Hartley", said his former WEC team-mate, Sky F1's Anthony Davidson, who added that the car's safety features "did their job" upon impact.
Hartley immediately jumped out of his auto and went to the Silverstone medical centre for a precautionary check-up, where he was given the all-clear to continue driving.
Luckily, the 28-year-old was able to walk away from the wreckage and gave fans a wave on his way to receive medical attention. On top of that, the team faces a fix job to ensure Hartley's auto is ready for qualifying, which starts at 2pm local time.