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What about the clutch reservoir? Isn't that attached to the master cylinder on the xrunner?
Ziggy, I guess I still do not understand. I'm not trying to start any flame wars or arguments. With that said, I still do not get why you need to change out the vacuum booster. What size is the bore on the Tundra master cylinder, 13/16", 1", etc? I saw it mentioned somewhere else, and I don't remember where, but do you know what size the bore is on the Tacoma master cylinder? If the caliper swap using the four piston Tacoma brakes makes the pedal softer on our X's, then it seems, I would think, a master cylinder with a smaller bore size would take away the soft feel. I would also think the vacuum booster has nothing to do with that part of the equation.