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Where is ABS sensor and how to clean?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

samkim69
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Where is ABS sensor and how to clean?

Post by samkim69 » Sat May 01, 2010 6:54 am

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
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Re: Where is ABS sensor and how to clean?

Post by claymore850 » Sat May 01, 2010 5:26 pm

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)

Ozark Lee
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Re: Where is ABS sensor and how to clean?

Post by Ozark Lee » Sun May 02, 2010 6:30 am

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:

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

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
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1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
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1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

wheelsup
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Re: Where is ABS sensor and how to clean?

Post by wheelsup » Mon May 03, 2010 9:08 am

Here's the fronts

Image
1995 850 GLT Wagon w/ 185,000 miles

loveMy850
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Re: Where is ABS sensor and how to clean?

Post by loveMy850 » Tue Jul 21, 2020 9:27 am

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

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Re: Where is ABS sensor and how to clean?

Post by abscate » Tue Jul 21, 2020 11:17 am

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

Sensor/wire
Abs module

Are the two failure points
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Re: Where is ABS sensor and how to clean?

Post by scot850 » Tue Jul 21, 2020 12:46 pm

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.
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Re: Where is ABS sensor and how to clean?

Post by loveMy850 » Tue Jul 21, 2020 1:09 pm

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

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