Hmm... I have my Brother HL-L2380DW printer & scanner working fine in Ubuntu Mate 17.10. I attached a couple of screenshots showing the printer side info and the scanner side info (on XSane)
I will try to dig deep on this to figure out what could be the issue. So far we know is not the Ubuntu version, not the Brother drivers (they appear to be well installed) . On the hardware side, just to be sure is not a device problem, did you test your Brother scanner in another PC with MS Windows?