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I'm using a hydroboost and master cylinder from an 08 6.4L SD on a rock crawler. Can someone confirm which master cylinder port feeds the front brakes? I'm assuming the rear port (closest to the firewall) feeds the front brakes, but I want to be sure and don't have a truck available to check.

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Interesting question. I had to go look. Rear port seems to be the answer. Just about all vehicles are plumbed this way it seems. You probably already know this but the two ports on the bottom do not go to the brakes. They can be plugged since you likely don't have cruise control on the rock crawler, and don't need the pressure switch.
 
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