Dumb Brake Plumbing Question - Removing a Wilwood Residual Pressure Valve

1-MV8 is likely correct in that you may have mis-identified which lines out of the master are going to the front and rear ports on the proportioning valve/distribution block (called proportioning or pro valve moving forward)

2-Typically the reservoir and port on the master cylinder that is closest to the firewall (or driver) feed the front brake circuit, the port furthest from the firewall feeds the rear.

3-Whichever circuit you have going to the front brakes is the one that you need to remove the residual pressure valve from. In fact, you likely don’t need to have a residual pressure valve on the rear line segment either as modern day wheel cylinders have cup expanders built into them, but it won’t hurt to have and RSV on the rear brake segment so I can be left.

4-if the lines from your master cylinder are indeed going to where you have shown in the proportioning valve I would say to remove RSV labelled “A”.

5-I am not familiar with the strange master cylinder and it is possible that the internal plumbing is reversed hence leading the rear reservoir to go down when bleeding the front brakes even though it appears like the front brake line is taken from the front reservoir/port location but I doubt it, - ALL OF THIS ACCORDING TO YOUR DIAGRAM - hence which leads me to believe that MV8 is correct in that you may have misidentified which lines go where.

Action plan: carefully follow and trace which lines go where in the pro valve from you very Strange master and then report back.