A brain generates the ability to make decisions. By means of its architecture and its information processing ability a brain is able to select options based on a set of criteria acquired, things to avoid, things that are pleasurable, rewarding, etc, through experience with the world....so it could be said that it's ability is form of freedom, but it is not free will. Will is not the agency of decision making. The decisions that are made are determined by an interaction of information processing, input from the external world and the critical factor of memory function.
See, where I think we're parsing definitions of 'will' here. To me, 'I' is the sum total of processes of my body, and my 'will' is the movement of my body through time and space. My will would cease to be free if I could no longer do the things my internal state wants to do.
I always find this difficult to put into words, but I find it strange when people talk of lacking free will like they're a ghost inside an alien, un-free body. This whole perspective is completely untenable to me, because people
are that information processing body / system. Angst over knowing who and what you are? Doesn't make sense to me, and is better than the alternative, imo.
The other part of it that I think is underrated is that the information/processing body is oriented in a way to seek out pleasure and avoid pain. And so this 'will' is actually moving us toward things we 'want' to do, even if the 'wants' are just a result of a mish mash of genetics and environmental experiences. This means that our lives are actually pretty pleasant, most of the time, regardless of how you want to define it.