here are the current models of Brother products that are supported.
http://support.brother.com/g/s/id/os/macintosh.html
if you model is supported the drivers will be on this page. If not contact the manufacturer and see if they have a driver for your specific model printer for this OS. Otherwise you may need to downgrade to a previous OS from a Time Machine Backup or a downgrade for compatibility if it is not offered by Brother for your model device on a computer running OS 10.11.
Apparently not all Bother DCP printers are compatible, but most that were compatible with OS 10.10.x still are according to their page.