Setup Brother Printer on Debian HOWTO
The Brother printer drivers included within CUPS (Common Unix Printing System) don't always work as well as they should. To get the Brother printer to work perfectly with Linux, it's necessary to install the Brother drivers. This can be done easily as follows.
gunzip linux-brprinter-installer-2.2.1-1.gz
chmod u+x linux-brprinter-installer-2.2.1-1
Then execute it at the prompt:
./linux-brprinter-installer-2.2.1-1
Type the name of your printer eg. “MFCL2740DW” and follow the instructions. When asked for an IP address (for the scanner), provide the IP number of the printer.
 Change the Default Settings and Permissions Using CUPS
Then, edit the file /etc/group:
sudo vi /etc/group
 $\pi$