I know that's a bit strange, but if you take care, you get 6 pistons brakes in the BMW Perf package which are different from the 4 pistons brakes so I think that's why you have to code it !
But on 135i there are already 6 pistons brakes, that's why you may not have to code a 135i contrary to other versions ...
We should wait for reviews of guys who mounted Perf or aftermarket brakes
2010 e82 120d : TiAg
/Blk, M Sport package, Stage 1 chiptuning 222hp 345lb/ft, CDV, BMC airfilter, VMR vb3, Eibach ProKit
BMW Performance : strut brace, pedals, gear konb and emergency brake, side skirts, spoiler, diffuser, exhaust ... I know, I have quite all the Perf' stuff