Dennis owns 25% of McLaren but has non-executive status and no role on the F1 side of the business.
But sources say he is trying to engineer his way back in charge of the team and believes Brawn is a potential candidate to take over as Whitmarsh.
The balance of the shareholding in the F1 team is held by the Bahraini royal family's Mumtalakat investment fund, which owns 50%, and Dennis's long-time business partner Mansour Ojjeh, who owns 25%
http://news.sky.com/story/1178061/mclaren-boss-dennis-plots-125m-share-swoop