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      01-12-2019, 09:41 PM   #1
GuyLedouche
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DIY F8X front wheel hub/bearing replacement

Disclaimer I am a highly trained individual, just not in auto repair. Exercise due diligence. Wear eye pro. Use jack stands. Practice safe sex. Etc.

Tools required
Torque wrenches with specs ranging from 12nm to 140nm
17mm lug socket
5mm allen
10mm socket
18mm socket
T-60 preferably impact rated

First crack the lugs and get car on jack stands.

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Remove wheel. Wheel removal tool is your friend.

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Remove caliper with 18mm socket.

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Hang caliper, avoid kinks.

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Remove rotor by removing 2 circled bolts with 5mm Allen. Use lug bolt to prevent dropping rotor on foot

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Remove dustguard if desired with 10mm socket

Remove 4 torx bolts attaching hub. Use a T-60 with breaker bar or impact

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Note tab on hub. This will locate at the bottom

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Mount new hub with NEW bolts. Torque to 120nm then tighten 90 degrees more. Mark your 90 degrees with a sharpie then tighten till your marks line up. Bolts are micro-encapsulated so no loctite required.

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Grab a beer and admire your work

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Remount dust guard with 10mm socket. Torque to 12nm. Mount rotor with 5mm Allen. Torque 2 Allen bolts to 16nm

Remount caliper with 18mm bolts. I used blue loctite then torqued to 110nm

Reinstall wheels and torque to 140nm

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Test drive and ensure nothing falls off. If anything departs the vehicle seek additional guidance.
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      01-14-2019, 11:52 AM   #2
nars3000
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Great write up! Those wheels look super creamy!
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      01-20-2019, 04:28 PM   #3
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What was the reason for replacing the hub?
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      01-21-2019, 11:02 AM   #4
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Quote:
Originally Posted by SD ///M4 View Post
What was the reason for replacing the hub?
Shop destroyed the threads when installing wheels.
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      01-21-2019, 12:14 PM   #5
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Quote:
Originally Posted by GuyLedouche View Post
Shop destroyed the threads when installing wheels.
Bummer! Looks like one of the wrench monkeys didn't get the threads started well enough before blasting the lug bolts with an air-driven impact gun.

So did you have to replace the hub yourself? I can certainly understand if you didn't want them touching your car after that though.
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      01-21-2019, 01:02 PM   #6
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Excellent write up and photos. No confusion and no unnecessary words.

🙏
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      01-21-2019, 03:24 PM   #7
GuyLedouche
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Quote:
Originally Posted by SD ///M4 View Post
Quote:
Originally Posted by GuyLedouche View Post
Shop destroyed the threads when installing wheels.
didn't want them touching your car after that though.
This.
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      01-21-2019, 03:58 PM   #8
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Quote:
Originally Posted by ellipsis212 View Post
Excellent write up and photos. No confusion and no unnecessary words.

🙏
Agreed. And listed torque values, a rarity in many DIYs.
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      01-22-2019, 09:19 AM   #9
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This DIY deserves an Oscar nomination!!! Great DIY!!! What is the cost for a new bearing/hub?
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      01-22-2019, 01:10 PM   #10
GuyLedouche
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Hub was $252 from getBMWparts
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      01-22-2019, 01:56 PM   #11
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Great DIY Mr Le Douche. I nominate for a sticky.
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      03-28-2019, 09:10 AM   #12
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      05-15-2019, 08:35 PM   #13
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Glad I found this... Thanks to getting new tires today looks like this project is in my immediate future.
At $252 did you buy the hub & bearing: https://www.getbmwparts.com/oem-part...bC1sNi1nYXM%3D

Any reason you didn't just buy the hub?
Also, which bolts did you buy? Do you have the PNs?
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      05-18-2019, 08:13 AM   #14
GuyLedouche
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Quote:
Originally Posted by RustySeatbelt View Post
Glad I found this... Thanks to getting new tires today looks like this project is in my immediate future.
At $252 did you buy the hub & bearing: https://www.getbmwparts.com/oem-part...bC1sNi1nYXM%3D

Any reason you didn't just buy the hub?
Also, which bolts did you buy? Do you have the PNs?
On the front it comes as an assembly and if you could buy separately I would still change the bearing.

31-20-6-872-920 is the PN I used.
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      06-17-2019, 11:22 AM   #15
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Quote:
Originally Posted by x.shell View Post
Great DIY Mr Le Douche. I nominate for a sticky.
Another thanks. Really good writeup.

Is replacing the rear wheel bearing (which has separate parts for the bearing and the hub) similarly straightforward?
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      08-05-2019, 03:39 PM   #16
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Quote:
Originally Posted by stonecliff View Post
Is replacing the rear wheel bearing (which has separate parts for the bearing and the hub) similarly straightforward?
No.


Seek additional guidance.
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      08-09-2019, 03:19 PM   #17
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Quote:
Originally Posted by tdott View Post
Quote:
Originally Posted by stonecliff View Post
Is replacing the rear wheel bearing (which has separate parts for the bearing and the hub) similarly straightforward?
No.


Seek additional guidance.
I just did the fronts. Very straightforward with just hand tools and a large torque wrench.

Rear bearings require a "special tool" which is just a hydraulic extractor required to pull hub off of axle
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      08-19-2019, 06:59 PM   #18
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How are you keeping your iron rotors so clean and rust free?
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