The MSR Camaro driver was untroubled across the 35 laps as he became the second surprise winner of the weekend, following Mark Winterbottom's drought-breaking victory yesterday.
It marked a first win for MSR and second for Le Brocq, who took a maiden victory at Sydney Motorsport Park in 2020 when driving for Tickford Racing.
It also followed a frantic repair job by MSR after Le Brocq's car was damaged in the earlier race today.
"I dunno, I'm a bit lost for words to be honestly," said Le Brocq.
"It's pretty unreal. The guys have done an awesome job, especially the last few hours getting this thing back together, it was pretty beat up after that second race today.
"I feel like it's been a long time coming. The heart rate is still going, it will take a whole to come down. That was a long 35 laps."
Le Brocq converted pole at the start of the race, matching Andre Heimgartner's launch and then having the line through the long first corner.
Source: Autosport