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I Think I Know What This Might Be! (ABS UNIT)

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Old Jun 26th, 2010, 12:33   #41
SwedishInside
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Still no ABS light

Easy fix!!!
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Old Jul 4th, 2010, 11:12   #42
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Again, Still no ABS light.

I HAVE CURED IT! HA HA.

Amazingly easy fix.

All info on the previous pages explains how to do it all.
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Old Feb 2nd, 2011, 21:13   #43
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Post UPDATE: A Little How To...

(I am happy for admin to move this to a "how To" section)
Right, so my ABS light now seems to want to stay on and my MOT is due soon... (My previous fix just didn't work)
I have had enough of this silly little pedal sensor, so I have decided to give it an evil operation. If it doesn't work then at least I can get a used one from the scrap yard?


SCROLL YOUR BROWSER WINDOW RIGHT IF THE IMAGES ARE NOT FITTING ON THE WHOLE OF YOU SCREEN.


Tools required:


1: Volvo 850 Brake Pedal Position Sensor:


2: Scrape off any previous sealant on top.


3: Try to slowly cut your way through and between the gap. (Breaking/slicing the sealant) Try not to break the plastic.


4: Then gently pull out the top half.


5: Careful when pulling the top half out.


6: Here is the top half pulled out. My solder joints here were not even connected... As I pulled the top half off, the board is supposed to be come up as well but mine disconnected from the board (bad solder joints). I had to get some pliers to pull the board from the bottom half of the barrel, up and out. When it is out get a soft toothbrush and give it a dry scrub. Then get some alcohol and rub the two strips clean. Mine were already clean but I done this anyway. (This photo is after I re-soldered the joints, I forgot to take a photo of my old dodgy joints)


7: Remove the spring from the bottom half of the barrel.


8: Carefully remove this white piece of plastic.


9: This piece of plastic has got fine metal 'hairs'... be careful when handling it.


10: The culprit to my ABS light (I hope). Here you can see I have re-soldered the joints.


11: Time to put it all back. This is all I had in my garage. I would have preferred black sealant but I can't be fussy. (I am also too impatient to wait till the shops open tomorrow morning.) I chose this product from my garage because it is waterproof and it should bond nearly anything, I hope.


12: After putting everything back inside the bottom half of the barrel, reverse of how I took it all out I then put a thin layer of sealant around the rim/edge of the top half. Then you have to push it back together. Push all the way in.


13: I then coated the top area with the sealant to prevent any water or dust from getting in.


14:


15: Now I have to let it dry. I will leave it for 24 hours to make sure it is completely sealed and dry.



That's it all complete. I haven’t tested it yet because I am writing this how to whilst the sealant dries. I hope it does work.
I will come back in a few days with another update with my conclusion whether this fix has worked.


(Sorry the photos are so large... Easier to see I guess - Future safe, when everyone get extra wide monitors)
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Last edited by SwedishInside; Feb 2nd, 2011 at 22:38.
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Old Feb 3rd, 2011, 13:59   #44
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Lightbulb Wrapped Sensor...

This morning I decided to give the sensor an extra piece of protection: Electrical tape (or insulating tape). I did this also for the look. Now my sensor will not stand out as much.

The tape is not dark blue... It is black, but I edited the image to make the tape standout from the black sensor so you could at least see how I wrapped it.

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Old Nov 18th, 2011, 21:10   #45
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Wahey thanks to this perfectly brilliant post i have know got rid of my annoying intermitent abs light my brake pedal position censor was exactly the same as the pictorial when l opened mine up the socket came away from the board in side so im kinda guessing this is a common problem with the bpps top man swedish inside
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Old Nov 18th, 2011, 22:22   #46
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What a superb post!
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Old Aug 28th, 2013, 04:16   #47
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Great post - works great & solved the issue on my 94 854 NA 5-speed - THANK YOU!! I also sprayed ABS wheel sensor bolts with PBBlaster, removed sensors, cleaned them carefully with Simple Green and a toothbrush. Reassembled. No ABS light, all codes cleared and have not re-appeared.
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Old Aug 28th, 2013, 12:27   #48
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Also something to consider on cars up to MY95 (especially when you get ABS code 4-4-4).
Near the ABS unit you have a big connector which stays normaly on the top of the shock absorber. Make sure the connector is fully closed and also not coroded. I had "fixed" this way more than 5 cars, on one (T5-R) Volvo Classic sugested to replace the ABS/TRACS computer
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Old Sep 18th, 2013, 22:16   #49
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Daft question but where exactly is the sensor on the 2003 S80?
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Old Jan 11th, 2014, 00:57   #50
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Would this also be the cause for my cruise control not working, absolutely nothing happens when the button is pressed, and I also get the service required warning orange triangle on startup.

I read somewhere that if I start the engine with the clutch in and the service message does not come on it could be this thats the cause, I tested that and sure enough starting with the clutch in it never comes on, it only appears after I release the clutch.
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