Brother DCP J140W Scanner Not Found

Just installed a new printer/scanner: Brother DCP J140W

Printing works fine.

xsane and simple-scan can not see the scanner.

Following instructions on the Brother web site, I have
1. Installed the diver:
sudo dpkg -i --force-all brscan4-0.4.1-3.amd64.deb
2. http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/instruction_scn1c.html#u9.10
sudo vi /lib/udev/rules.d/40-libsane.rules
ATTRS{idVendor}=="04f9", ENV{libsane_matched}="yes"
3. Rebooted.

xsane says "no devices available"
simple-scane says "no scanners detected"
Same even if I sudo xsane or sudo simple-scan.

One post I saw suggested adding users to the 'lp' group. Tried that, with no success.

$ scanimage -L
No scanners were identified....
$ sudo sane-find-scanner
No USB scanners found....

But,
$ brscan-skey -L
 DCP-J140W : brother4:bus4;dev1 : USB Not registered

If I then use this device in:
$ scanimage -d 'brother4:bus4;dev1' > test.png
The scan works.

Any idea what is going on here - why does scanimage but xsane & simple-scan do not?
How can they be made to work?

EDIT:
$ simple-scan 'brother4:bus4;dev1'
and
xsane 'brother4:bus4;dev1'
also work.

So I guess the question is: why can't xsane/simple-scan find the device without being told its name explicitly?

Thanks for any help.