Usually, when you don't have the drivers for your printer, you go to the manufacturer's site and try to find the drivers. This time, I did it for you, so here is a link. All you have to do is choose your OS and download the drivers http://welcome.solutions.brother.com/bsc/public/eu/eu_ot/en/dlf/download_top.html?reg=eu&c=eu_ot&lang=en&prod=mfc8860dn_all
Answers & Comments
Usually, when you don't have the drivers for your printer, you go to the manufacturer's site and try to find the drivers. This time, I did it for you, so here is a link. All you have to do is choose your OS and download the drivers
http://welcome.solutions.brother.com/bsc/public/eu/eu_ot/en/dlf/download_top.html?reg=eu&c=eu_ot&lang=en&prod=mfc8860dn_all
Hope that will solve your problem!