I dont have the one in the photo (what make is it?) but I have some thoughts. I wonder what happens if you disconnect a valve input line? Does fluid begin to gravity feed out the line? If not your master may not retract enough to open the ports to the resevoir. This might be a rod that is too long for your application.
If fluid does come out then it must be something to do with the valve. A true combination valve will hold off the front disc callipers so that pressure can build up in the rear (to get rear drums working before bringing in the front brakes). Maybe this explains the front not bleeding, is the rear not bleeding either?
With the valve lines connected can you step on the pedal to see if the increased pressure gets the fluid moving?
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Kevin Murray
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Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
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