Brake question

[superdave]

I have a 69 dart which had power drum brakes.
I have upgraded to all disc brakes.
I added a power booster from a 75 dart and a mopar alum 1 1/32 master cylinder from dr diff.
I can't get fluid from back port of master cylinder.
The front will release fluid but not back.
Am I missing something?
It all went together really well....
Dave

 

[1970Duster]

Did you change your proportion valve when you did the brake upgrade?

 

[superdave]

I will...
Havent got that far.
Cant even get fluid out of the mc without lines on it...
Dave

 

[vitamindart]

did you bench bleed the master? sometime they can be a real Pita!