Line Lock problems!!!!!

brian6pac said

If you are using the safety valve, the one with the switch that turns on the brake light on the dash if there is a pressure problem. When you release the rear brakes by letting off the pedal the pressure on the front pushes the valve and you loose your front pressure.

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Brian this car has the original porp. valve. I do notice there seems to be a post for a electrical connection on the porp. valve. Could it be doing this? If I understand this right after I apply the line lock and release the brake the pressure is being redistributed inside the porp. valve reducing the pressure through out the whole system?