Hi deano. Problem solved.
I copied the missing libnsl.so.1 and rebooted, then xsane started to detect the scanner 
It was good I asked this problem here, your pointers got me pupmed-up to try to find-out what really is the problem. Maybe I got lucky with this scanner today but I don’t know what will happen after another snapshot.
ldd /usr/lib64/sane/libsane-brother3.so
linux-vdso.so.1 (0x00007ffd355f0000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f00a3151000)
libnsl.so.1 => /lib64/libnsl.so.1 (0x00007f00a3135000)
libusb-0.1.so.4 => /lib64/libusb-0.1.so.4 (0x00007f00a312d000)
libm.so.6 => /lib64/libm.so.6 (0x00007f00a3044000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f00a303f000)
libc.so.6 => /lib64/libc.so.6 (0x00007f00a2a00000)
/lib64/ld-linux-x86-64.so.2 (0x00007f00a3171000)
Thanks again your help is very much appreciated. More power.