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97 850 glt Rear Brake Sensors Removal

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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ronzara
Posts: 51
Joined: 7 February 2012
Year and Model: 850 GLT 1997
Location: South Carolina

97 850 glt Rear Brake Sensors Removal

Post by ronzara »

I am having an ABS/TRAC light issue.
I removed the front sensors... very nasty and greasy. I cleaned them,... all shiny now and put them back in,...
Took the car around.... lights still on.

I decided to remove and clean the rear sensors... removed the 10mm bolt... expecting to wiggle it right on out... NO SUCH LUCK.
Tried pliers to get a better grip,... NOPE.

Decided to grind a flat screwdriver down to a sharp edge and tap it between the sensor and the backplate.
Well, it gave about 1/16th of an inch before the sensor cracked.
GREAT!!! :x :x :x

Still not out, I dont want to chance breaking it completely in two.

SO,... anyone have a clue on how to get these damn things out???
Are they heat welded to the hub,... or am I missing something?

Thanks.
RZ
Last edited by matthew1 on 03 Mar 2012, 08:04, edited 1 time in total.
Reason: Please, no "help" or "HELP" in titles. Thanks.
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Matty Moo
Posts: 1810
Joined: 12 October 2008
Year and Model: 850, 1996
Location: Ann Arbor, MI
Has thanked: 1 time
Been thanked: 30 times

Post by Matty Moo »

Honestly, it's rare to have an issue with the rears....nothing ever happens back there. Fronts, possibly but still not very often.....but it's usually the socket or the wiring that is in the open.

Now your kinda-maybe hosed....but you may still be alright if its just cracked. You can check the resistance of the sensor without pulling it out using a multimeter and going from the harness that plugs into the module.

95% of the time its the module, 5% of the time it's something else.
Image
http://www.midwest-abs.com
Simplycleanpowerwash.com

1996 850 Platinum Wagon. ARD Green Tune, OBX.-Gone
1998 s70 ARD tune, EST exhaust, SE/R interior.
1999 s70 Plain Jane.
2000 s70 GLT
2014 Ram
2012 Jeep Wrangler Unlimited
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ronzara
Posts: 51
Joined: 7 February 2012
Year and Model: 850 GLT 1997
Location: South Carolina

Post by ronzara »

Well, from all I've been able to find... you just take out the 10mm bolt and slip the sensor out of the hole,...
Humm, It's not working for me. It's like that sucker is glued in with some Strong glue.... It guess brake dust has heat welded it in.

Also after a lot of searching, it seems that the ABS modules solder joints are 99% of the ABS/TRAC light issues. SO... (fingers crossed I haven't already screwed up the one rear sensor but trying to get it out)...
I am going to attack the The ABS Module tomorrow with my sodering iron... Hopefully this will Fix those pesky lights.

Wish me Luck!!
:roll:

RZ
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ronzara
Posts: 51
Joined: 7 February 2012
Year and Model: 850 GLT 1997
Location: South Carolina

Post by ronzara »

HOLY CRAP.... It worked.
I opened the ABS module and resoldered the pins... Reinstalled and took it for a spin. At 20 mph, the ABS and TRAC light went out and did not come back on.

I guess the has solved my issue . :D
OH YEAH!
Thanks everyone.
RZ
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