I've done this loads of times to my 140 and it does seem to take an age but I get there in the end. If the pipes are all tight, air shouldn't be getting in and assume the fluid level is always kept up in the cylinder when doing it. Leave the brake light switch out until all done.
There is a specific order listed in the book to do it and I do it manually rather than with pressure and always allow over a litre of fluid to do it properly. Even if a seal had gone, you should see excess leaking somewhere.
Good luck
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