60 Brake Proportioning valve (below master cylinder)

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I am trying to get the brakes figured out on a 1985 60. New master Cylinder, new front calipers and pads, new rear pistons, shoes and hardware. Cannot get things to bleed, I believe it is the proportioning valve but do not know how to test it. I have seen somewhere about a test in the FSM but cannot find it or the thread I read it in. Do not want to buy a new one if its not needed. Ideas please? I know that I read somewhere "Do not open the proportioning valve" or some such BS but I'm a guy that opens everything so I know how it works. Exploded diagram would be great. I believe I saw one somewhere but cannot find it.
 
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Dec 26, 2020
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57701
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I found it, I also found a thread on a corvette forum that shows how to do the rebuild. Might be worth a try
brake valve cutaway.jpg
 

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