Brakes: 850: - ABS light, on and off when it feels like it.

LankyTim · Mar 11th, 2019, 19:37

Hi all,

My 1997 2.0 auto 850 is in for it's MOT tomorrow but the ABS light sometimes stays illuminated after start up, obviously this is going to be an MOT fail.

I haven't driven this 850 far, I got it without an MOT and have been repairing the few things it needs.

Does the ABS light go out once the car goes over a certain speed? Once off it seems to stay off for the rest of the day.

Any advice?

Bob Meadows · Mar 11th, 2019, 19:59

https://www.volvoforums.org.uk/showt...ght=abs+module

Tim: ~ had a similar problem a few months back on my ’97 V70. Now sorted by soldering the module points- some other work done as can be seen in the attached post.

The ABS light comes on with the ignition and should extinguish very quickly prior to starting. Once the module repair had been completed then when road tested above approx. 15mph it went out and stayed out (reset not required for this V70)
You will have to keep things crossed for the MOT regarding the light being on? Prior to fixing but quite a straight forward fix once you identify the cause.
Good Luck
Bob.

LankyTim · Mar 11th, 2019, 20:57

Thanks, fingers crossed for the MOT! if it fails i'll try your advice.

DaveNP · Mar 12th, 2019, 10:57

If it is dodgy solder joints in the module the bodge that I posted in the thread Bob has linked to worked until I did a proper job of resoldering the board in the module (you might need to make it look a bit tidier than my picture to keep an MOT tester happy).

Clogs · Mar 12th, 2019, 16:26

Wedge a couple of old credit cards or cardboard visiting cards to sort of tighten the joint down the side of the module... might work as a temporary fix so the ABS light goes out after start up.

The module unplugs by swivelling it down, and it can become a bit loose.

The speedometer is likely to die along with cruise control when the ABS doesn't work.

LankyTim · Mar 12th, 2019, 22:17

Well it passed the MOT with just one advisory on greased brake pipes! So pretty pleased.

I'll see how the ABS light behaves once it's on the road. Thanks for all the advice!

Bob Meadows · Mar 13th, 2019, 11:33

Great! Always a relief

LankyTim · Mar 14th, 2019, 06:46

I just need to find out why the interior is filling up with water now!

Mar 11th, 2019, 19:37	#1
LankyTim Missing the point Last Online: Feb 5th, 2023 23:12 Join Date: Nov 2001 Location: Stoke-On-Trent View Photos By: LankyTim	ABS light, on and off when it feels like it. Hi all, My 1997 2.0 auto 850 is in for it's MOT tomorrow but the ABS light sometimes stays illuminated after start up, obviously this is going to be an MOT fail. I haven't driven this 850 far, I got it without an MOT and have been repairing the few things it needs. Does the ABS light go out once the car goes over a certain speed? Once off it seems to stay off for the rest of the day. Any advice? __________________ Tim 1968 Volvo 145 long term project. Currently without a Volvo daily driver.

Mar 11th, 2019, 20:57	#3
LankyTim Missing the point Last Online: Feb 5th, 2023 23:12 Join Date: Nov 2001 Location: Stoke-On-Trent View Photos By: LankyTim	Thanks, fingers crossed for the MOT! if it fails i'll try your advice. __________________ Tim 1968 Volvo 145 long term project. Currently without a Volvo daily driver.

Mar 12th, 2019, 10:57	#4
DaveNP Non VOC Member Last Online: Yesterday 19:37 Join Date: Jun 2011 Location: Milton Keynes	If it is dodgy solder joints in the module the bodge that I posted in the thread Bob has linked to worked until I did a proper job of resoldering the board in the module (you might need to make it look a bit tidier than my picture to keep an MOT tester happy). __________________ David V70 2.5 10v Torslanda Manual 98 Sreg

Mar 12th, 2019, 16:26	#5
Clogs Clogs Last Online: Dec 26th, 2023 08:04 Join Date: Dec 2012 Location: Canterbury	If the module solder joints are dodgy Wedge a couple of old credit cards or cardboard visiting cards to sort of tighten the joint down the side of the module... might work as a temporary fix so the ABS light goes out after start up. The module unplugs by swivelling it down, and it can become a bit loose. The speedometer is likely to die along with cruise control when the ABS doesn't work.

Mar 12th, 2019, 22:17	#6
LankyTim Missing the point Last Online: Feb 5th, 2023 23:12 Join Date: Nov 2001 Location: Stoke-On-Trent View Photos By: LankyTim	Well it passed the MOT with just one advisory on greased brake pipes! So pretty pleased. I'll see how the ABS light behaves once it's on the road. Thanks for all the advice! __________________ Tim 1968 Volvo 145 long term project. Currently without a Volvo daily driver.

Mar 11th, 2019, 19:59	#2
Bob Meadows Premier Member Last Online: Today 16:22 Join Date: Sep 2017 Location: STANDISH LANCASHIRE	https://www.volvoforums.org.uk/showt...ght=abs+module Tim: ~ had a similar problem a few months back on my ’97 V70. Now sorted by soldering the module points- some other work done as can be seen in the attached post. The ABS light comes on with the ignition and should extinguish very quickly prior to starting. Once the module repair had been completed then when road tested above approx. 15mph it went out and stayed out (reset not required for this V70) You will have to keep things crossed for the MOT regarding the light being on? Prior to fixing but quite a straight forward fix once you identify the cause. Good Luck Bob.

Mar 13th, 2019, 11:33	#7
Bob Meadows Premier Member Last Online: Today 16:22 Join Date: Sep 2017 Location: STANDISH LANCASHIRE	Great! Always a relief

Mar 14th, 2019, 06:46	#8
LankyTim Missing the point Last Online: Feb 5th, 2023 23:12 Join Date: Nov 2001 Location: Stoke-On-Trent View Photos By: LankyTim	I just need to find out why the interior is filling up with water now! __________________ Tim 1968 Volvo 145 long term project. Currently without a Volvo daily driver.

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