6 piston conversion

[JHartman]

wondering if anyone is running an OEM 6 piston conversion on their m3 ?

[Obioban]

wondering if anyone is running an OEM 6 piston conversion on their m3 ?

Which calipers are you thinking of?

[Bostonbruck]

wondering if anyone is running an OEM 6 piston conversion on their m3 ?

I heard the 135i ones are not good. (The oem yellow ones)

[Obioban]

I heard the 135i ones are not good. (The oem yellow ones)

Yep, they’re garbage— pistons crack when they get hot.

[Arith2]

Definitely good to know. That's why they're so cheap I guess. If a piston cracks, that could literally kill you.

When I read the title I was thinking how our car already has six pistons and HAD to see how to convert our engines to an OEM 6 piston design. You meant brakes.

[liam821]

Yep, they’re garbage— pistons crack when they get hot.

You can replace the pistons with StopTech aluminum pistons that are typically used in the ST-60 6-piston StopTech calipers, but by the time you go to all the effort and money, you might as well just get something else to start with that is better - they're not the best match for the e46m3. A bunch of us run Porsche calipers, Aston Martin DB9 (which is what I run), or StopTech/Brembo kits.

This page from 1addicts has the info to fix the broken piston issues

https://www.1addicts.com/forums/showthread.php?t=441050

[JHartman]

Yes , I had heard the BMW 135 i calipers had their issues . I wanted to see if anyone had fitted other OEM Brembos on CSL rotors ? I was thinking like GM ( Corvette or Cadillac ) or Audi or VW .

[Arith2]

What is the ideal brake bias and what do these set ups offer? I can imagine track and street optimal bias should be the same because you go around a lot of corners and must stop quickly sometimes. The pads be the only thing to be changed, I would think.
My Braking Systems class was taught by an idiot so I didn't really learn anything new. Hopefully Mercedes has a good class on it. I probably won't take a performance class until I start getting into AMG certification classes sadly. That's a few years away. It's not BMW but I will absolutely be sharing everything I learn.

[liam821]

Yes , I had heard the BMW 135 i calipers had their issues . I wanted to see if anyone had fitted other OEM Brembos on CSL rotors ? I was thinking like GM ( Corvette or Cadillac ) or Audi or VW .

There are brackets available for Porsche 911 and Aston Martin DB9 calipers which both use CSL rotors. DB9 calipers are the same as Audi TTRS 8J calipers.