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I have a 87 mustang gt that i installed a dics brake rearend. For some reason my rear brakes are not working. Ive put new calipers ,rotors, and brakelines in the rear as well as switched to a wilwood porpartioning valve. Im using the 87 mastercylinder . I plugged off the bottom and used the other to ports. Ive bled the brakes and the fronts are working but nothing at the rear. There in fluid to the rear brakes but im guessing not enough pressure to push pistons in. Am i missing something here or should they be working? The p-valve is adjustable and ive tried applying most of the pressure to the back and still nothing. For the emergency brake i went with the ford racing cables . When its applyed still no braking. Someone please helppppppppppppppppp!!!!!!!!!!
 

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Did you adjust the proportioning valve, and use a gut plug? And why did you switch the lines around? Last but not least you need at least a 1" bore MC and cobra booster
 
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