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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Help. AbS lights on after rear bearing replacement.



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      10-10-2013, 09:33 PM   #1
2008_335i_coupe
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Help. AbS lights on after rear bearing replacement.

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My abs lights and brake light is on the dash after my rear passenger side wheel bearing replacement.
I thought it was abs sensor and replaced and it is still on.
I bought a timken bearing and installed it with the black side facing inward.
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      10-12-2013, 09:57 PM   #2
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TTT...
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      10-15-2013, 07:38 PM   #3
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Anyone??
I have searched high and low online.
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      10-16-2013, 09:01 AM   #4
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Same thing happened to me last year. I bought the part from pep boys (was the oem supplier). Changed the sensor, still had the issue. Got another new bearing from bmw, problem solved.

I know, the last thing you want to do is take that thing apart again
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      10-19-2013, 01:30 PM   #5
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Crap. I didn't want to have to do that.
The bearing did say *** on it which is OEM.
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      10-19-2013, 02:18 PM   #6
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Did you get a Timkin or a F@G? Sure it isn't the problem either way. Black end, red end....I am not sure which end goes in first, but am pretty sure it does matter since the "pulse ring" for the ABS sensor to read RPM is only on one side.

I see F@G uses a red end for the pulse ring side and that needs to face out...not sure what Timkin does. (haven't done bearings yet myself, so no hands on experience)

edit:
Ok, would seem the red side is just a seal and the black side is the magnet. All pics I see of F.A.G. bearings shows the spindle with the red of the bearing just behind it, so would assume the sensor picks up the magnet on the backside....so maybe you put it in backwords if you put the black part in first. Not exactly sure, just guessing. Take a look at where the ABS sensor is, if possible put a screw tip near your bearing and see if you can feel the magnet. Check on your other side to compare.

Last edited by Casca; 10-19-2013 at 03:27 PM.
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      10-20-2013, 08:12 AM   #7
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The bad ones I got were f.a.g. (they should consider a new name for their company). My guess was that I got one for an e46 330i instead of an e90, since I have a 2006, just a guess though. But I looked the part number up on their website and it was indeed the correct part number.

Long and the short, but it from the dealer.

Here's the rub.... with my cca discount, the part was cheaper at the dealer than schlep boys. :mad:
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      10-20-2013, 09:40 AM   #8
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the sensors were plugged back in weren't they before stressing about it?
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      11-05-2013, 01:15 PM   #9
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I have replaced the sensor and checked then connections.
One I am checking again is to make sure no anti-seize compound is in the sensor hole on the bearing.
If that doesn't work I am replacing the bearing again.
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      12-07-2013, 11:22 AM   #10
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This is the thread that had me worried about if I was putting my bearings in correctly. F.A.G does say red side out, but the OP here did that and had problems so that caused a lot of doubt for me. And then I couldn't really find info that was conclusive for BMW's. So I did the same direction as 2008_335i_coupe did and no problems. Everything worked great. Red side out, black side next to the ABS sensor for an F.A.G bearing



I don't know what went wrong with the OP's ABS light, but if he had an F.A.G bearing and pressed it with black side next to the sensor and red side out, that isn't the problem.

I did notice that even though I pressed it in far enough to be able to get the c-clip in the groove, looking at the back side, there was still more space for the bearing to be pressed farther. So I pressed until the bearing actually bitted up against the lip.
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