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 Hi all looking for some more help on my neighbor's 
' 70 AMX. On the passenger side firewall is a brass block, 4 brake lines go in 
and it has a switch and two plugs at opposite ends shaped like a H . I believe 
it's to let you know if you lose front or rear brakes. I removed it (we're 
changing all the lines and hoses) and took out the plugs on the sides to clean 
it out. There is a pin (horizontal) that I believe should move. If it doesn't 
move is this thing wasted?  
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