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      07-14-2021, 02:41 PM   #1
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Correct rotor hold-down bolt part number(s) for M Roadster?

For anyone that has replaced the rotors on a Z4 M Roadster, what is/are the correct part number(s) for the rotor hold-down bolts?

On realoem.com, they are called "inner hex bolts" and they show p/n 34111123072 for the front rotors and p/n 34211161806 for the rear rotors. However, when I tried ordering the -072 bolt I got a warning that "this part does not fit your Z4 M Roadster".

realoem.com also shows a total of four bolts for the front and four for the rear, which I assume is two for each rotor. Is this correct? Seems like other BMWs have only one hold-down bolt, but I've never replaced rotors on a BMW before.
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      07-16-2021, 09:29 PM   #2
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they new ones I ordered from ecs were different from my original ones, the heads were slightly different. they worked fine though. I assume the original ones were superseded ....
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      07-16-2021, 10:00 PM   #3
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Quote:
Originally Posted by kaybat View Post
the new ones I ordered from ECS were different from my original ones, the heads were slightly different. they worked fine though. I assume the original ones were superseded...
What part numbers did they send you, if you still have that info?
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      07-19-2021, 09:56 PM   #4
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I don't sorry.
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      07-20-2021, 06:34 PM   #5
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That looks right.. fcp shows it for 06 M
https://www.fcpeuro.com/products/bmw...123072#fitment
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      07-26-2021, 12:26 PM   #6
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Ok, realoem.com was right. All of the online retailers are wrong when they say that BMW p/n 34111123072 does not fit a Z4 M Roadster, and here's the proof.

p/n 34111123072 is the hold-down bolt for the front rotors and p/n 34211161806 is the hold-down bolt for the rear rotors. Both are M8x12 but they are distinctly different. The front rotor bolt is smaller in size and requires a 5mm Allen socket while the rear rotor hold-down bolt is larger and requires a 6mm Allen socket. In addition, the rear hold-down bolt will not fit inside the hole seat in the front rotor and does not fit flush with the surface of the rotor due to the additional "shoulder" on the bolt and the larger face.

Fortunately, all of the hold-down bolts came off easily with an impact driver after an application of Liquid Wrench. The front hold-down bolts were in pretty good shape, cleaned up pretty well, and can be re-used, while the rear hold-down bolts were quite rusted.

And yes, there are two hold-down bolts in each rotor.
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      07-26-2021, 12:41 PM   #7
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Thanks for the follow up
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