Where is ABS sensor and how to clean?

samkim69 · Post by **samkim69** » 01 May 2010, 06:54

Hi,

First of all, I tried to find the post here, but I can't find any picture of abs sensor. If I missed it, sorry.

I found many useful posts about how to replace ABS module, but I want to clean sensor first.

Can anyone let me know how it looks like or where it is?

I took 4 wheels off today and had a look behind wheels. but still not sure which one is which one-.-;.

Thanks,

claymore850 · Post by **claymore850** » 01 May 2010, 17:26

The ABS sensors are located behind the brake disc, over the axle shaft, are a cilindrical piece with two cables on the body..

you can take a look on this link...

http://cgi.ebay.com/ebaymotors/93-97-97 ... ccessories

You can clean them with a soft brush, I dont recomend to use any kind of cleaner..maybe a dielectric cleaner...but with care..
after clean the sensor tight it to 10 NM (7.5 lb ft)

Post by **Ozark Lee** » 02 May 2010, 06:30

On a '98 it is 99% likely that the module itself is bad but I cannot say that it isn't a bad thing to check out the sensors and the reluctance rings or tone rings as they are often called.

On the FWD versions the fronts are fairly easy to get to to clean. The sensor is screwed into the top of the steering knuckle and the rings are slightly inset into the back of the steering knuckle.

The rears are a bigger deal. The sensor is fairly easy but to get to the rings you need to remove the rear brake caliper and the rear rotor.

You can see the rear rings (this is a FWD car and a AWD may be different) in pictures 3 and 8 in my writeup here:

https://www.matthewsvolvosite.com/forums ... 6225#26225

...Lee

Post by **wheelsup** » 03 May 2010, 09:08

Here's the fronts

loveMy850 · Post by **loveMy850** » 21 Jul 2020, 09:27

Where is the ring? My light comes on can't get cel to go off needs snogged

Post by **abscate** » 21 Jul 2020, 11:17

The ring is on the wheel hub , but it rarely goes baD

Sensor/wire
Abs module

Are the two failure points

Post by **scot850** » 21 Jul 2020, 12:46

In CA I would not expect the ring to go bad. They can go bad where there is a lot of salt or moisture causing rust as they can get rust behind the ring in the hub causing them to split. As per your other thread on the subject I would be looking at the connector shown in the picture above. The connector is just below the red ring which is the hold down bolt for the sensor. If you need to remove the sensor itself, I would clean the area well and then soak it with penetrating oil like PB Blaster (not WD-40). The bolt is small and at this age could break.

Neil.

loveMy850 · Post by **loveMy850** » 21 Jul 2020, 13:09

TY could the ABS sensors cause my CEL to stay on ?

the79bomb · Post by **the79bomb** » 22 Aug 2020, 13:55

I just landed here to give cleaning my sensors on a '95 850 a try. For posterity the procedure I used was to remove one wheel at a time providing easy access to the 10mm bolt and sensor. I then used clean cotton cloth to wipe the sensors clean. The location of the sensor is obvious with the wheel removed. Unfortunately that did not fix my speedometer issue but I did remove a lot of gunk and metal bits especially from the rear sensors. It would be possible to do without removing the wheels but not worth it.