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ABS kicking in for no reason

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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jakeizchillin
Posts: 21
Joined: 5 March 2009
Year and Model: 1993 850 GLT
Location: Los Angeles
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ABS kicking in for no reason

Post by jakeizchillin »

For the past couple of months the ABS will kick in when not needed. This typically happens when the car is still cold or within 5 minutes of driving it. I was told this is probably due to a dirty ABS sensor. I was wondering if there is an easy, inexpensive fixt for this? Thanks!

FCPEURO
Posts: 3002
Joined: 17 June 2009
Year and Model: 2006 XC90 V8
Location: Milford, CT
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Post by FCPEURO »

I'm not sure the exact design of this specific system but have you tried taking a look at the sensor(s)?

Ozark Lee
MVS Moderator
Posts: 14798
Joined: 7 September 2006
Year and Model: Many Volvos
Location: USA Midwest
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Post by Ozark Lee »

Clean the reluctance rings and the sensors. The fronts are fairly easy to get to, the rings are slightly inset behind the steering knuckle. The rears are harder to get to but easier to clean. You need to remove the brake drums to get to the rings on the rear.

I don't have a picture of the fronts but there is a picture of the rears in this thread.

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

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

jakeizchillin
Posts: 21
Joined: 5 March 2009
Year and Model: 1993 850 GLT
Location: Los Angeles
Been thanked: 1 time

Post by jakeizchillin »

I can't see it but at least I know where to look. Thanks again Lee!

Ozark Lee
MVS Moderator
Posts: 14798
Joined: 7 September 2006
Year and Model: Many Volvos
Location: USA Midwest
Has thanked: 4 times
Been thanked: 75 times

Post by Ozark Lee »

The best picture of the ABS sensor and the reluctance ring in that writeup is the one titled New shoes installed with springs. The reluctance rings look like a plastic gear.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

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