For my Brother printer, I did not use Yast. I downloaded the rpm of the printer driver (mine has a scanner too so I downloaded that driver too) from Brother Support. I then followed their instructions and installed the driver via the terminal. I then rebooted and it works great.
First I downloaded the driver from Brother to my Downloads directory. Then I changed the directory in terminal to get to the directory that contains the downloaded printer driver file: cd Downloads. The syntax I then used to install the printer driver, per Brother, was: sudo rpm -ihv --nodeps [insert your printer driver]
for example, for me that was, sudo rpm -ihv --nodeps hll2390dwpdrv-4.0.0-1.i386.rpm
I hope that might be helpful.