In 2015, Brabham made his Stadium Super Trucks debut at Honda Indy Toronto; Brabham, who was at the track working as a driver coach, received the opportunity to race after Paul Tracy became unavailable due to television obligations.
He finished sixth and fourth in the weekend's two races.
Later in the year, he competed at the Gold Coast 600, Valvoline Raceway, and the Sydney 500 events, recording runner-up finishes at Gold Coast and Valvoline.

Brabham began racing in the series on a full-time basis in 2016.
In June, he swept the Detroit Belle Isle Grand Prix rounds.
He later joined Team Traxxas, driving the No.
83 alongside Sheldon Creed.
Brabham scored his third win of the season when he held off Creed at Toronto.
He finished second in the 2016 standings, 75 points behind Creed, with three wins and 16 podiums.

For the 2017 season, he acquired sponsorship from Safecraft Safety Equipment.
His first win of the year came in the Firestone Grand Prix of St. Petersburg, where he became the first non-Australian SST race winner, followed by victories at the Grand Prix of Long Beach, Hidden Valley Raceway, Beijing National Stadium, and Watkins Glen International.
He finished runner up to Paul Morris by one point.

He continued in the series for a fourth year in 2018.
His first win of the season came at Adelaide Street Circuit's third race, where he capitalised on Robby Gordon entering the final corner too wide on the last lap.
Further triumphs came at Long Beach, Barbagallo Raceway, Texas Motor Speedway, Road America, and Sydney Motorsport Park.
Brabham battled with Gavin Harlien for the championship throughout the season, and a victory at the season-ending 2019 Race of Champions clinched him the 2018 title.
His six wins led the series in 2018.

Brabham opened the 2019 season by winning the second race of the Circuit of the Americas weekend despite suffering from a foodborne illness the previous night.
After winning again at Long Beach when he beat Creed, Brabham went on a three-race string of runner-up finishes; his two second-place runs at Toronto earned him that weekend's overall win.
Additional wins came at Mid-Ohio Sports Car Course and Portland International Raceway.
In the series' Australian return at Gold Coast to end the year, Brabham was involved in last-lap incidents in both races: in the first round, he spun race leader Toby Price in turn 11 that led to Gordon winning, while he dodged contact between Morris and Cole Potts to win the second.
He finished the year with a series-high six wins and 13 podiums to clinch his second straight title.
In 2015, Brabham made his Stadium Super Trucks debut at Honda Indy Toronto; Brabham, who was at the track working as a driver coach, received the opportunity to race after Paul Tracy became unavailable due to television obligations. He finished sixth and fourth in the weekend's two races. Later in the year, he competed at the Gold Coast 600, Valvoline Raceway, and the Sydney 500 events, recording runner-up finishes at Gold Coast and Valvoline.
Brabham began racing in the series on a full-time basis in 2016. In June, he swept the Detroit Belle Isle Grand Prix rounds. He later joined Team Traxxas, driving the No. 83 alongside Sheldon Creed. Brabham scored his third win of the season when he held off Creed at Toronto. He finished second in the 2016 standings, 75 points behind Creed, with three wins and 16 podiums.
For the 2017 season, he acquired sponsorship from Safecraft Safety Equipment. His first win of the year came in the Firestone Grand Prix of St. Petersburg, where he became the first non-Australian SST race winner, followed by victories at the Grand Prix of Long Beach, Hidden Valley Raceway, Beijing National Stadium, and Watkins Glen International. He finished runner up to Paul Morris by one point.
He continued in the series for a fourth year in 2018. His first win of the season came at Adelaide Street Circuit's third race, where he capitalised on Robby Gordon entering the final corner too wide on the last lap. Further triumphs came at Long Beach, Barbagallo Raceway, Texas Motor Speedway, Road America, and Sydney Motorsport Park. Brabham battled with Gavin Harlien for the championship throughout the season, and a victory at the season-ending 2019 Race of Champions clinched him the 2018 title. His six wins led the series in 2018.
Brabham opened the 2019 season by winning the second race of the Circuit of the Americas weekend despite suffering from a foodborne illness the previous night. After winning again at Long Beach when he beat Creed, Brabham went on a three-race string of runner-up finishes; his two second-place runs at Toronto earned him that weekend's overall win. Additional wins came at Mid-Ohio Sports Car Course and Portland International Raceway. In the series' Australian return at Gold Coast to end the year, Brabham was involved in last-lap incidents in both races: in the first round, he spun race leader Toby Price in turn 11 that led to Gordon winning, while he dodged contact between Morris and Cole Potts to win the second. He finished the year with a series-high six wins and 13 podiums to clinch his second straight title.
Matthew Brabham