Tokyo, SAEDNEWS: The teenage skateboarder had qualified in second place for the final at the Ariake Urban Park, with a best score of 57.40. After falling in her first two runs of the final, she nailed her last attempt with a score of 56.47 to finish behind Japanese pair Sakura Yosozumi, 19, and Kokona Hiraki aged 12.
After her heats, Brown told the BBC: "That was insane. It is crazy. It is crazy to be here, and skating with all the girls has been really fun.
"Everyone has been ripping. It is awesome to be here. I didn't think about the scores. But I am really stoked on that score - very stoked."
The teenager replaces Sarah Hardcastle as Britain's youngest summer Games medallist. The swimmer was aged 15 years and 113 days when she won silver and bronze in Los Angeles.
She also overtakes silver medal-winning figure skater Cecilia Colledge, who turned 15 just a couple of months before the 1936 Garmisch-Partenkirchen Games.
And Brown's achievement is all the more remarkable for the fractured skull and broken bones she suffered during an horrific fall in training last year.
The teenager posted a video clip of the fall on her Instagram account, which has approaching one million followers, along with the message: "I'm excited to come back even stronger and even tougher. My heart wants to go so hard right now."
CEO of Skateboard GB James Hope-Gill told Sky's Kay Burley: "One of the messages Sky wants to give is it doesn't matter how old you are, how big or small, girl or boy, go for your dreams. If you work hard and are committed you can achieve anything." (Source: SKYNEWS).