Dubs
I'm Awesome
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See that rubber dust cover on the left lower side, behind that you see the nut looking thing. That's the plug. If you unscrew that plug with a wrench it comes off and there is a long piston in there with several o-rings on it. I'm guessing and strictly guessing either one is ripped or you need to take some off. I'd do a little more research first. But since you replaced everything I'm betting your issue is there. Brake pressure is like fuel pressure in the fact that too little or too much is bad. You have to be in the "window of happiness " to work properly.