Prosto z faq brothera:

1. Open the file "/etc/udev/rules.d/45-libsane.rules" with an editor.

(w 8.04 trzeba stworzyc ten plik)

2. Add the following description to the file as below:

#brother
SYSFS{idVendor}=="04f9",MODE="666",GROUP="scanner"
LABEL="libsane_rules_end"

potem restart i powinno ...