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I'm puting a skyjacker rear brake extension on my truck. I looked at the back and saw that there is a manifold welded to the axle that has 4 things going into it, the obvious is the brake fluid feed line, then there are the 2 lines going to the wheel cylinders. What is the 4th bigger tube for? And do I replace the entire manifold with the new one I got from skyjacker?
