[GeorgeKLT]

Hi all,

I went ahead and upgraded the front brakes(pads, rotors, calipers, carriers, disc protections) on my e90 318d prod. year 2009

from the 300mm x24mm stock discs now it has the same setup of a 335d namely 348mm x 30mm

Should I change the brake master cylinder as well, same questions applies to brake booster. Below you can see the only difference between the master cylinders.

stock brake master cylinder
cylinder bore 1 [mm]:22,20
cylinder bore 2 [mm]: 23,81

335d brake master cylinder
cylinder bore 1 [mm]:22,20
cylinder bore 2 [mm]: 25,40

For brake booster I was not able to find any technical details, so I was not able to see the difference except they have different Part Numbers.

Please let me know your thoughts, since only the front brakes have been upgraded would you leave it as it is or would you change brake master cylinder/brake booster and perform coding as well.

Thanks.

[allex29]

when you have a 1.8 and need the brakes from a 3.5...better have changed the distribution =))

[GeorgeKLT]

that was the first thing replaced on the car

[david in germany]

Leave the master cylinder as is but code the car with +spbr.