Download the two .deb packages from Brother's website:
- mfcj480dwlpr-1.0.0-0.i386.deb
- mfcj480dwcupswrapper-1.0.0-0.i386.deb
Install them both at the same time: sudo apt install mfcj*.deb
Add a new printer using the GUI and enter the IPP URI manually like: ipp://<ip>:631/ipp
In the Printer Settings -> Printer Options change Media Size to Letter (unless you're using A4 of course).
It should now work.