It seems like the left margin is fine, but the top and right margins over-run making it seem like the page is cut-off at top and right. It's as if the page were printed too high and too far right.
I installed the printer using the drivers from the Brother website with the following procedure:
sudo apt-get remove --purge cups sudo apt-get install cups sudo apt-get install ia32-libs lib32stdc++6 sudo dpkg -i --force-all ~/Downloads/hl2240lpr-2.1.0-1.i386.deb sudo dpkg -i --force-all ~/Downloads/cupswrapperHL2240-2.0.4-2.i386.deb
In properties I have manually set the page size to "Letter". (It defaults to A4).