Q:

What's the volume of Brikka 2 cup water chamber? 

I received a used 2 cup Brikka without the measuring cup.  
Anyone knows what is the volume of this measuring cup? 

A:

MT San' answer is not correct.  He gives a link for Moka Express measurement.  Brikka is different.  2 cup version should be filled with 60-70 ml of water in the bottom chamber. 
Check the upper chamber, if you have new version of Brikke (Brikka Elite) there should be a measuremnt mark like on this photo (look for "H20" mark): http://101coffeemachines.info/wp-content/uploads/2018/05/bialetti-brikka-valve.jpg

