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Changing the hubs can affect the required offset for the rims. If you change to 130i hubs, you will reduce the rear track by 10~11mm per side. E92 coupe 335i rear hubs are probably the same as the 130i hubs (you should check part numbers on real oem website). E90 LCI sedans had wider rear track than the E92 coupe, but I don't know if the E90 LCI sedan caliper brackets would be a direct fit on the 135i without changing the hubs. Its important to figure all this out before you buy new wheels, so you can choose the best offsets.
I think brake pad selection may be an advantage for changing the rear brakes, however its not essential to run identical pads front and rear. You would have changed the brake bias by swapping calipers anyway. Somewhere there is a thread that goes into detail about brake bias effect of 335i calipers vs M3 vs 135i, according to the piston diameters.
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