I was wondering as I was typing whether it would have a vacuum booster or an electric one.i see the booste. not seeing vacuum line i see about 5 electrical connections and break hard lines. i could be missing something let me go recheck.
brake booster issue. could be as simple as a vac line or could be a problem with the booster itself.
There should be a fuse for the ABS system. If so, unplug the fuse and start up and test your noises and brake pedal then. But don't drive like that.
That has got to be the most on topic and coherent post I have ever seen you make...