Don't expect the pedal feel you used to have... these wagoneer calipers are much bigger than the stock Nissan ones and the master cylinder has a hard time filling them up.
I can push my pedal all the way to the floor if I step on it hard - but it stops just fine and I have no plans to change anything.
People have talked about putting in a master cylinder from a Titan or a 300Z - but I don't know if anyone has done it and what kind of adapters it takes.
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