how to do a breaker in mortal kombat?

Answer 1

Hold forward and press the Block button as your opponent is striking you.

This uses 2 sections of the X-Ray bar, though.

Answer 2

Here is a list of all the moves.

http://www.gamemunition.com/guides/mortal-kombat-2011-characters-guide/

Answer 3

for the kombo breaker press forward + block button