Help identifying brake calipers

[Enigmatik]

Hi Folks,

Hoping someone might be able to help. I bought some brake calipers from Ebay, marked as Z4 3.0, (not sure if Si or not and breaker couldn't confirm) with the aim to upgrade the ones on my 2006 2.5 non Si. I'm finally getting around to sending them away for refurb and based on what the refurb place is showing, the ones I have have different sizes. Their advert shows 57/25 front calipers and 42/22 calipers, the ones I have are 57/25 and 40/19 rear. This has let me to wonder if there is a way to identify the caliper brackets so I can see what size discs they correspond too, incase I've been misled and these aren't for a Z4, won't fit.

The front bracket shows Ate 570 and 3435 - Google seems to say X5 with various engines, maybe z4 2.5Si?

Rear has F255, 2 Ate CM/CN and 506 on it - Google finds similar on e46 320d but seem to come with different rear disc sizes

Would anyone with a e86 3.0, Si or not know what calipers and brackets they have? Either way would be a upgrade for me, just need to figure out what discs I need! Any help is appreciated.

 

[Zedebee]

57/25 and 40/19 is the correct size for 3.0Si.
You will need 325 x 25mm front discs and 294 x 19 rears.
You will also need the right size calliper carriers from a 3.0Si.

 

[Enigmatik]

Hi Zedebee,

Thanks for that, just need to identify these carriers then. Ate 570 and 506 seem to be what I have, but guess the same calipers could be on different brackets. The 570 seems to match a x3 2.0d which has 325 front discs and the 506 seems to match 320d which had 294 rears at some point, which I think match 3.0 Si sizes.

 

[Zedebee]

The 3.0Si front calliper is the same as the X3 2.0D and E46 330D/330i, but only the E46 calliper carrier is compatible.
The rear calliper and the calliper carrier are the same as most models of the E46 (318-328), but not the 330D/330i.

RealOEM is your friend here.
https://www.realoem.com/bmw/enUS/showparts?id=DU52-EUR---E86-BMW-Z4%203.0si&diagId=34_1285