[Kel918]

Hey guys I just installed the f10 m5 6 piston calipers and f80 m3 rear 2 piston calipers on my car and the car doesn't brake anymore. I have 2013 base 328i xdrive n26. Like I was saying the brake pedal loses all pressure and the car will barely stop. I did some research and saw that I would have to code the car for the new brakes. What program do I need to do that ?? Definitely appreciate any help I can get




Edit: The problem was resolved after installing the f80 m3 Master Cylinder, i'm pretty sure you can use the 335/340 master cylinder as well. I would also like to thank everyone for their help and contribution to figuring this out.

[Fudz]

coding AFAIK only affects the front to rear bias.

Are you sure they are bled correctly? Could you of got air into the mastercyclinder- did it run dry at any time ?

[Kel918]

The were bled by the shop after installing them, I'm pretty sure they didn't run dry or air got into the master cylinder. I read in a thread that the brakes have to be coded. it's a base 328 so I was thinking coding to m performance brakes might help

[Fudz]

if the pedal loses pressure their is air in the system. its not a coding issue.


are all the bleed nipples pointed up? I've seen shops put calipers on the wrong way round believe it or not .

[Kel918]

The bleed nipples were defintely pointed up, I was watching everything. The only reason I took it to the shop was because I had to get the m5 rotors bored out to fit the front properly.

[insane11]

when change my 6 pot brake in front and brembo 2 piston rear i didnt code and the car still brake normal.i think you need to upgrade your master cylinder depend on which brake you were coming from.. that was my main concern when i upgrade to the m5 caliper ..

[Fudz]

an undersized MC will give a firm pedal but no braking force.

[Kel918]

The shop said the same thing, that I went from having a total of 6 pistons to 16 now on the car, and that the brake master cylinder can't produce enough pressure. If that's the case should I just upgrade to an m3 brake master cylinder ??

[Kel918]

You have to pump the brakes a lot to build pressure and it will stop, but if you leave it alone for like 10 seconds it wont have any pressure to stop again

[insane11]

Originally Posted by Kel918

The shop said the same thing, that I went from having a total of 6 pistons to 16 now on the car, and that the brake master cylinder can't produce enough pressure. If that's the case should I just upgrade to an m3 brake master cylinder ??

yup m3 master cylinder

[Kel918]

Ok I'm going to just get the master cylinder from the m3 and see if that works

[insane11]

Originally Posted by Kel918

Ok I'm going to just get the master cylinder from the m3 and see if that works

since my 435i have the grey brembo front i didnt have to upgrade to the m3 mc when i did the m5 brake ..

[Kel918]

Originally Posted by insane11

since my 435i have the grey brembo front i didnt have to upgrade to the m3 mc when i did the m5 brake ..

It makes perfect sense since you already had the 4 piston grey brembo's and only went up to 6 pistons on the m5

[Gen13 F36]

Definitely look good tho... awesome upgrade...60 to 0 in 60 ft.

[Kel918]

Originally Posted by Gen13 F36

Definitely look good tho... awesome upgrade...60 to 0 in 60 ft.

Thanks!! got a good deal on all the calipers and rotors

[blau3er]

You have a master cylinder issue.

Nearly all cars optioned with the blue brakes from factory have the same MC as the F8x, meaning you won’t have an issue when these brakes are fitted.

I was the first to do this, and researched it heavily before having the work undertaken to get the brackets done.

If your car came with base brakes (single piston sliding) then you’ll no doubt need to upgrade the MC.

It does sound like you may also have air the the system, was it bled using INPA to cycle the modules?

[Kel918]

I have the base (single sliding piston), it was not bled with Inpa to cycle the modules. What software can I buy to code the brakes and cycle the modules ??

[blau3er]

Originally Posted by Kel918

I have the base (single sliding piston), it was not bled with Inpa to cycle the modules. What software can I buy to code the brakes and cycle the modules ??

My brakes are not coded, other than how the blue set up left the factory.

These 6 pot brakes are not OEM fit for F3x cars, so coding is not an option.

If you have air in the master cylinder or DTS / DTC module, the software can / will cycle the modules to dislodge air.

I do not have the technicals on this, since I paid a shop to do this for me.

[Kel918]

Thanks a lot for the information, I'm going to have find a shop or take it to the dealer.

[blau3er]

Originally Posted by Kel918

Thanks a lot for the information, I'm going to have find a shop or take it to the dealer.

BMW will definitely be able to properly bleed the brakes for you, wether or not they will do it for you with “non standard” brakes is another matter, depends on how well you get on with them I guess.

I’m putting my money on your MC being insufficient though for the larger piston area.

These 6 pots have a very similar overall piston size vs the OEM 4 pot Brembos for F3x, so the correct MC handles them perfectly.

[Kel918]

definitely going with the master cylinder first and then try to get the coding done. I just need to get the program/software for bmw like audi has vag com

[blau3er]

Originally Posted by Kel918

definitely going with the master cylinder first and then try to get the coding done. I just need to get the program/software for bmw like audi has vag com

I wouldn’t get too hung up on the coding side of things.

It’s a mechanical issue with not having enough power in the MC