The beaten National League South play-off semi-finalists were almost resigned to losing their talisman after nine years at the club.
When long serving manager Tony Burman left Princes Park, Bradbrook was expected to follow.
But new managers Jamie Coyle and Adam Flanagan convinced the midfielder to extended his stay to a decade and told him he is too important to lose.
It’s not the only piece of good news. Goalkeeper Deren Ibrahim has also committed to a new contract.
Bradbrook tweeted: “It’s been a great honour to lead the boys out for so many years, but while I will no longer be at the front of the line, I look forward to contributing all I can in the season ahead.
“All good things must come to an end.....but not just yet!
“I’d like to thank the new management team for listening and going above and beyond to keep me the club.
“They didn’t have to do that, and I really appreciate it.
“I would also like to personally thank Tony Burman, Skip and Steve for their tremendous efforts over such a successful period in Dartford’s history. The club is undoubtedly what it is today because of them.”