For benefit of anyone who is replacing the pressure switch in their rear brake master cylinder...
Most of the ones for sale on ebay are too long.
You could turn one down in a lathe, or, look for one that says it's good for Ducati/KTM/Other European marques.
These folks use Brembo too.
You can tell from the photos that the ones for Japanese bikes re too long; the threaded part is not in proportion to the other end.
It's a std 10mm diameter with a 1mm thread.
(90% of these things are 1mm, a few are 'coarse' 1.25mm thread).
Mine cost me just over 5 UKP, delivered. This is about 6.5-7 USD.
Now for the fun of bleeding the rear brake
Mike