[exploderjim]

Now I have found a 08 and a 2012 Master cylinder from a Silverado HD running 4 wheel disc brakes. would that work and two i would still need to run my CPP porportioning valve as well right? Here is my issue I just want to confirm that I'm understanding this correctly and that it will bolt to the master cylinder. The 2012 is a hydroboost set up as well. Anyways any help would be appreciated/