ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Roadster and Coupe > Z4 DIY (Do It Yourself) Articles
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      07-14-2021, 02:41 PM   #1
SD ///M4
///Multiple
SD ///M4's Avatar
United_States
2992
Rep
4,243
Posts

Drives: M4 Coupe | M3 | Z4M Roadster
Join Date: Jan 2011
Location: San Diego, CA

iTrader: (1)

Garage List
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.
__________________
The Coupe: 2016 M4 | Sakhir Orange | Black Full Merino Leather | CF Trim | M-DCT | More | ED 5/13/16
The Sedan: 2018 M3 | San Marino Blue | Black Full Merino Leather | CF Trim | M-DCT | ZCP | ED 7/18/18
The Roadster: 2006 Z4 | Interlagos Blue | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12

Appreciate 0
      07-16-2021, 09:29 PM   #2
kaybat
First Lieutenant
kaybat's Avatar
United_States
126
Rep
355
Posts

Drives: '06 Z4MR, '14 Cayman S
Join Date: Aug 2013
Location: Ormond Beach,Fl

iTrader: (1)

Garage List
'06 Z4M  [0.00]
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 I assume the original ones were superseded ....
__________________
Ken B.(BMWCCA/PCA/ZSCCA/SCCA)
Appreciate 1
SD ///M42992.00
      07-16-2021, 10:00 PM   #3
SD ///M4
///Multiple
SD ///M4's Avatar
United_States
2992
Rep
4,243
Posts

Drives: M4 Coupe | M3 | Z4M Roadster
Join Date: Jan 2011
Location: San Diego, CA

iTrader: (1)

Garage List
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 I assume the original ones were superseded...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?
__________________
The Coupe: 2016 M4 | Sakhir Orange | Black Full Merino Leather | CF Trim | M-DCT | More | ED 5/13/16
The Sedan: 2018 M3 | San Marino Blue | Black Full Merino Leather | CF Trim | M-DCT | ZCP | ED 7/18/18
The Roadster: 2006 Z4 | Interlagos Blue | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12

Appreciate 0
      07-19-2021, 09:56 PM   #4
kaybat
First Lieutenant
kaybat's Avatar
United_States
126
Rep
355
Posts

Drives: '06 Z4MR, '14 Cayman S
Join Date: Aug 2013
Location: Ormond Beach,Fl

iTrader: (1)

Garage List
'06 Z4M  [0.00]
I don't sorry.
__________________
Ken B.(BMWCCA/PCA/ZSCCA/SCCA)
Appreciate 1
SD ///M42992.00
      07-20-2021, 06:34 PM   #5
rsutoratosu
Captain
113
Rep
778
Posts

Drives: Z4 3.0i
Join Date: Mar 2011
Location: Chicago, IL

iTrader: (0)

That looks right.. fcp shows it for 06 M
https://www.fcpeuro.com/products/bmw...123072#fitment
__________________
-Roranji
Appreciate 0
      07-26-2021, 12:26 PM   #6
SD ///M4
///Multiple
SD ///M4's Avatar
United_States
2992
Rep
4,243
Posts

Drives: M4 Coupe | M3 | Z4M Roadster
Join Date: Jan 2011
Location: San Diego, CA

iTrader: (1)

Garage List
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.
Attached Images
 
__________________
The Coupe: 2016 M4 | Sakhir Orange | Black Full Merino Leather | CF Trim | M-DCT | More | ED 5/13/16
The Sedan: 2018 M3 | San Marino Blue | Black Full Merino Leather | CF Trim | M-DCT | ZCP | ED 7/18/18
The Roadster: 2006 Z4 | Interlagos Blue | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12

Appreciate 3
XMetal1096.50
Reborn_292.00
kaybat125.50
      07-26-2021, 12:41 PM   #7
XMetal
Colonel
XMetal's Avatar
United_States
1097
Rep
2,846
Posts

Drives: Anything
Join Date: Apr 2010
Location: SoCal

iTrader: (0)

Garage List
2008 Z4M Coupe  [10.00]
2018 Audi S3  [0.00]
2004 X5  [8.50]
Thanks for the follow up
__________________
Appreciate 1
SD ///M42992.00
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 01:02 PM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST