Best combination, e9x m3 subframe, final drive and arms with 135i brakes and rotors! Did the 135i rotor fit over m3 hand brake shoes and the caliper bolt up to m3 swivel bearing?
I dummy fitted 135i twin piston caliper onto rear of 1M today with the standard(1M/M3) 24mm thick rotor and it was no dice. I didn't get as far as to try the 135i rotor. I did however try F20 M135i rotors and caliper, m135i rotor won't fit over the hand brake shoes.