Do you use Ubuntu Intrepid/ Jaunty and your Brother Printer cuts off some part of the pages when printing, regardless of which paper setting you chose?
Well then this command might help you.
brprintconf_<your_model> -pt A4 # brprintconf_dcp135c in my case
the problem is, that the user interface in ubuntu only changes the CUPS settings while the brother drivers are LPR, so the settings are without effect. The command above on the other hand changes the LPR settings. If you want to know all the command options, look here.