GNU/Linux Kali 2020 Brother Printer Setup – Step by step Guide
The linked tutorial shows you step-by-step How to Install Brother Printer on Kali 2020 GNU/Linux desktop – Step by step Tutorial.
And to Achieve the Brother Printer Setup for Kali 2020 you need first to Download and Install the Printer Driver.
Especially relevant: after the Driver Setup to achieve the Printer Installation follow instructions to Add Printer.
Finally, for the Multifunctional Models you find also included instructions on How to Get Started Scanning on Kali.

GNU/Linux Kali Brother Printer Driver Installation