I believe I've found the answer so I'm posting it here for anyone else who would like to know:

There don’t appear to be any examples of colon insertion if the brand name is already at the front of the page title. This is interesting since when Google decides to tweak the titles as above, it removes the dash or the pipe and replaces these with a colon. However if the brand name is already at the front, Google is happy to leave the dash or the pipe in.

From: http://socialmediatoday.com/georgestevens48/1317336/google-rewriting-page-titles-time-brand

I am about to change the brand name to Hebrew so it will be in front of the page title so I'll be able to confirm it.
Will update you with the results.