Brother MFC-8440 B - Manual (Page 48)

2 - 5 PAPER
How to load paper
To load paper or other media in the paper tray
1
Pull the paper tray completely out of the MFC.
2
While pressing the paper guide release lever, slide the adjusters
to fit the paper size.
Check that the guides are firmly in the slots.
For Legal size paper, press the universal guide release button
and pull out the back of the paper tray.
Universal Guide Release
Button