Are you positive your brakes lines - front and rear - are hooked up to the Master cylinder in the proper position?
Many "ASSUME" that the front line goes to the front reservoir... and in some M/C that isn't the case.
Also - what else is in line with this system? Is the combo valve plumbed correctly?
The brake light is indicating a LOW PRESSURE situation.... could be air trapped where the switch goes in...
I can't imagine a hydroboost of any kind was designed for drum brakes.... I'm just putting my own "thinking" out here - but I would think they came after most OEMS had already upgraded their stuff to disc/disc. Maybe not.
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