Ford 9" pinion brake

I was trying to figure out a way to use a normally closed solenoid valve to isolate the pinion brake. The line lock seems to be a normally open. I did find one valve but not sure it can handle the pressure.
 
I guess what im.asking is, are your brakes manual and are you using two of those MC or ?? Are you using a combination power brakes and manual?
 
Two manual master cylinders on the same brake pedal. One runs all 4 wheel brakes and has two outputs. The second has one output and runs the pinion brake alone.
 
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