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At the risk of being pedantic, I wanted to clarify that it is the take-up cylinder diameters that differ between the various master cylinders assemblies. The "master cylinders" are all 22mm while the take-up cylinders, which apply no pressure to the brakes, are larger in diameter to compensate for the increased fluid volumes of the larger front brake cylinders. 128i is 23mm, 135i is 25mm, and the 1M/M3 is 26mm. I still have a 1M master cylinder to install to get rid of the excessive pedal travel I have due to installing the 135i/Performance brakes. 1M vs 135i only because I got a great deal. The "excessive" travel isn't that bad, just annoying.
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