velocewest said:
A friend of mine did this on his NK sedan, which would have the same front end as a 2000CS. If I recall, the recipe was '77 320i stub axles bolted to the NK strut, with e3/e9 hubs, calipers and rotors. I'll ping him and see if I can confirm.
This won't work. On both 2000CS/NKs and E21 320i s the "stub axles" are welded to the rest of the strut.
If I were going to try this, I would use the E9 front hubs, 2800CS solid front rotors and see if the 2800CS calipers would bolt on. This may require turning the rotors down slightly to fit. It would require replacing the master cylinder and running an additional brake line to each caliper, but you would definitely have better brakes as the E9 pads are considerably larger.
If that parts mix didn't work I would try just using the whole E9 strut, hub, rotor and caliper.
If someone is really serious about this, I will dig out the parts and see what fits.
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67 2000CS, 70 2002ti, 2 x 72 3.0CS, 77 320i, 633, 635, E30 325i, E46 330Ci ZHP