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135i brakes on 335i is NOT an upgrade! Well it is but only cosmetically!
If you do this there isn't any need to replace the master cylinder.
f30 would make the brake pedal soft so you want to upgrade to M3 master cylinder.
Master cylinder from f30 is not interchangeable and that chassis has programmable brake module.
You can program it according to the size of the brakes and size of the wheels installed.
Most vehicles with electrical steering which is also programmable have programmable brakes as well.
VW has these features since 2005 and BMW is just late in the game.
f30 series come with different rotors and calipers which is determined by the engine size and the package: base, sport and performance.
Front f30 from any model would fit any e90, the rears NO, and that is on every e90.
I hope I answered all of your questions.
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