BMW performance 135i Brakes on e46 M3 clearance questions

[Trtj]

Hi all, a question for the cutters maybe..

Do you know if there are any caliper clearance issues with the popular 135i 6 pot brembo upgrade? Wheels would be OEM 19" or Apex 18" probably ET42.

Any advice welcome.

Cheers

[SebringMan]

With M4 calipers there are clearance issues. They required 10mm spacers from memory to clear the calipers.

If you can get the sizes to both that may provide you with an answer. I'll be watching this thread with interest.

[Cheapstraitsix]

I I’ve run them wit various wheels and never had an issue.

Even had them under 17” pro race 1.2.

[rassi]

No clearance issues, but you would of course need the necessary bracket to fit the calipers.

[Trtj]

Thanks rassi, yep I'm aware of the brackets. With all these big brake upgrades, how much extra power do you get? Yes you have more surface area with 6 pistons, but the master cylinder force is always the same unless you change that...which no one does. More surface area and same hydraulic force means actually less pressure on the disc!

Looks like also with the 135i 6 pots they made a bodge/fix to the caliper after opening the forging mold. I can only think those two big bolted on 'ears' are mass dampers there to shift resonance lower.