Welcome to EOS
You need to install dpkg from aur.
Then you can run the script to install the driver, look here https://support.brother.com/g/b/downloadend.aspx?c=th&lang=en&prod=mfcl2700dw_us_eu_as&os=128&dlid=dlf006893_000&flang=4&type3=625
for my brother printer I got it to work by putting the following into cups:
ipp://[printer IP]/ipp/print