Line Lock problems!!!!!

Coffee&Cars said

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?

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Yes it might be, when you appy the brakes there is pressure on both sides of the valve holding it centered, if a line fails the pressure goes to one side and pushes the valve and that grounds the switch turning on the light, you could test it with a bulb 12v on one side and the other side to the switch. if you release the brakes with the line lock on if it pushes the valve the light will come on.