Like I said, I have no specific bronco info. Don't know if its a ebrake speicfic light.
I design instrument clusters and used to design brake systems, so my info in generic. Most vehicle don't have a 'ebrake' light. They have a 'brake' like, which is a combination light which usually lights with the ebrake is on, and also when there is a loss of fluid in the master cylinder, or other system fault.
First step in diagnosing a 'brake' light should always be to check the fluid.