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Where do i start? Ok i have an 87 mustang gt that i put a 93 cobra rear end in Disc brakes). I used my stock mastercylinder and put in a wilwood p-valve. My front brakes are working but i cant get my rear brakes to work at all. Ive bled them over and over. When i crack the bleeder open i have fluid dribble out but you can tell theres no pressure there. Ive tried adjusting the p-valve but get the same . What am i missing here?
 

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While the 1987 Mustang will some day be considered a "Classic", posting your question in this forum is a little premature.

Might want to remove the proportioning valve, hook up the stock valve, and then check for rear brake function. Double check you have the lines going in the right ports too.
 

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You may want to start by checking that cocktail of parts to be compatible, after that it seems that the wilwood valve is not providing enough pressure to the back of the "circuit" (maybe it needs more pressure to open?).
 
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