Cat 215 concrete breaker removal

[Dgreen4298]

I have a cat 215 95z00480 that had a breaker on it at one time.there is an aftermarket solenoid operated aux Valve with one line for the supply, one line for return, one line for the breaker and a smaller line that went from the bottom of the solenoid valve to the return to tank in the main machine manifold along with the breaker return line. I removed all the lines and plugged the main supply from the machine main manifold that went to the solenoid valve for the breaker.Now my front pump is building pressure all the time without operating any implements. Is there something that I need to do in order to stop the flow from exiting out the main manifold to the plug that I put on when I removed the hose that went to the breaker valve. The main control valve for the front pump just has a plug in that spot, I took it off to see if there was something in there and there is not. The photo I’ve included is upside down because it’s like that in the book for some reason, the beyond power is actually on top in the machine

 

[Dgreen4298]

So here is the main valve that the breaker gets its supply from. It’s hooked to the circled area and there is no pilot that turns on and off to supply the aux valve. This same port is capped on the main valve for the other pump. So why when I cap this side does the pump build pressure?