I looked into this issue at length and posted a write-up here:
http://forre.st/brother_printer

The gist of it is that setting up a Brother printer with an invalid
model name (e.g. "MFCL5900DW" instead of "MFC-L5900DW") can cause
crashes in some cases (namely simple-scan in photo mode).

Fix:

* (optional) Check "/opt/brother/scanner/brscan4/brsanenetdevice4.cfg" to see 
if the configured device has an invalid model name (by cross-referencing with 
the output of "brsaneconfig4 -q")
* Delete /opt/brother/scanner/brscan4/brsanenetdevice4.cfg
* Re-add the scanner with a command similar to "brsaneconfig4 -a 
name=MFC-L5900DW model=MFC-L5900DW nodename=BRN3C2AF4738657"

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https://bugs.launchpad.net/bugs/1769126

Title:
  SIMPLE-SCAN crashes when set to photo scanning

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