Translations:Brother networked printer/165/en
From Gentoo Wiki
Some of Brother scanners are supported by media-gfx/brscan4 package. This contains the proprietary binary Brother scanner driver. That can also be installed manually as rpm (see below). This driver does not seem to use eSCL, but accesses e.g. printer TCP port 54921 with some simple proprietary protocol for selecting configuration. Therefore, it is often able to allow higher resolutions.