My brother is mently disable but not too much just 40%.
I am having forever visa and my wife has nationality.Would
it be possible for me to bring my brother in Germany for
his treatment ? But not on private checkup, i mean i am
not millionar earning just 40k/year.
Is there any way .......... i mean on the bases of public health or any other.....?(i am from Asia)

You cannot get free treatment for sure.

This should be your start site,
http://www.germanmedicine.net/
There might be many other medical associations like the above one in Germany. Go through this website thoroughly atleast you can get an idea like for example costs http://germanmedicine.net/en/costs.html

Check also this,
http://www.medknowledge.de/germany/treatment/treatmentcosts.htm

all the best!