View Full Version : Removing ABS Speed Sensors
trevtherev
17-02-2010, 07:04 PM
http://www.godscroft.co.uk/ebc/car/abs%20speed%20sensor%20-%20passat.jpg
(Passat 1.8 TDi 2001)
Just pull it out the Haynes manual says . . . but it won't move.
Is the shiny silver bit part of the sensor or is that the sleeve?
The plastic bit rotates with respect to the silver bit but won't separate from it.
Is there any hope of getting this out non-destructively?
passat 130 tdi
17-02-2010, 07:42 PM
the silver is the sensor . wd40 it and work it out by twisting.
trevtherev
18-02-2010, 11:11 PM
OK, thanks passat 130 tdi, that info was useful. My Petersen long nosed vice grips wouldn't do it so I ground down some cheap short nosed vice grips and they got the left side out OK
http://www.godscroft.co.uk/ebc/car/left.jpg
but the right side didn't go so well:
http://www.godscroft.co.uk/ebc/car/ahem.jpg
- but now at least I know whats inside them:
http://www.godscroft.co.uk/ebc/car/nasty.jpg
Haynes manual says I need to remove the "sleeve" - don't know if there is much chance of that - will it be OK just to leave it?
passat 130 tdi
19-02-2010, 03:37 PM
you will need to find a drill bit the size of the hole and drill the old sleeve out , so you can fit a new sensor.
but now at least I know whats inside them:
I always wanted to know, so thank you :)
passat 130 tdi
19-02-2010, 09:02 PM
I always wanted to know, so thank you :)
you should of asked :D ,, its basically an electro magnet .
creedxup
20-02-2010, 01:13 PM
The part on the end of the wires is the sleeve isn't it?? If so just fit the new sensor.
passat 130 tdi
20-02-2010, 01:32 PM
he's talking about the old sleeve stuck in the hub as in the picture.
trevtherev
20-02-2010, 01:40 PM
The part on the end of the wires is the sleeve isn't it?? If so just fit the new one.
I am assuming that is the sensor - that wire all came out of it - and that the sleeve is still in the hub carrier casting.
The Haynes manual says: "pull the sensor out from the hub carrier assembly and remove it from the vehicle. With the sensor removed slide the rubber seal and clamping sleeve out from the hub carrier."
(I don't know how they think you could remove the sensor without removing the rubber seal first though:confused: - look at the top photo here - I presume Haynes are talking about the rubber seal which I've pulled back to get at the silver bit.)
At the start of this thread I asked if the silver bit was the sensor or the sleeve, and passat 130 tdi replied that the silver is the sensor.
So I'm assuming there is still something in there that could be removed, but haven't looked closely or tried yet.
Is the sleeve a separate part or will it come with a new sensor (probably from Ebay)
creedxup
20-02-2010, 05:20 PM
http://www.godscroft.co.uk/ebc/car/left.jpg
It doesn't look like there's anything else in that hole but rust
cazyp
20-02-2010, 05:46 PM
To me it looks like it's all out.
trevtherev
20-02-2010, 09:48 PM
It doesn't look like there's anything else in that hole but rust
I agree - but I've just been and had a look:
http://www.godscroft.co.uk/ebc/car/sleeve.jpg
- and there is a sleeve in both of them - it is springy brassy metal and should be fairly easy to get out. It looks like the idea is that the sleeve and the sensor are corrosion free metal and should just slide out without too much trouble - in theory at least if not in practice on a 9 year old car.
tullyjoe
21-02-2010, 05:48 PM
Nightmare, they really get a grip and are very hard to remove in one piece.
Second hand one not too dear, watch for 2 wire or 4 wire though.
Joe
trevtherev
24-02-2010, 11:45 PM
http://www.godscroft.co.uk/ebc/car/sleeve-out.jpg
Here is the sleeve having been taken out and cleaned a bit. Unfortunately that speed sensor which came out OK, must have been damaged as it is open circuit across the two pins in the connector. Is there any reason why I shouldn't buy a cheap one on Ebay?
grover
26-02-2010, 11:28 AM
I had to remove a faulty one a year ago - what a pain! I did figure it would be very unlikely i'd have to do that side again on a 10 yr old car so i left the sleeve in situe.
I think* when you rotated the plastic part about the shiny part you more than likely severed the connecting wires inside.
Tom
trevtherev
26-02-2010, 08:18 PM
Yes I suppose it must have been like wringing its neck - poor thing.
caldirun
27-02-2010, 09:03 AM
Yes I suppose it must have been like wringing its neck - poor thing.
When you fit the news ones make sure you coat them with Copperslip and seat the rubber seal properly, they have to be removed if you need to do the cv joints or wheel bearings.
trevtherev
02-03-2010, 01:01 AM
When you fit the news ones make sure you coat them with Copperslip and seat the rubber seal properly, they have to be removed if you need to do the cv joints or wheel bearings.
I've never got on too well with that copper grease - tend to use Waxoyl. I think I'll be tempted to use some of that - and put plenty under the seals. If I thought they wouldn't be disturbed for many years, I think I'd be tempted to try sealing with silicone under the seals, as going by the rust and dampness inside, it looks like the seals haven't done a great job. I wonder though if moisture - can enter from the other end.
trevtherev
17-03-2010, 12:33 PM
Just a quick follow up re fitting the new sensors - I nearly got into trouble forcing a new one in after cleaning the hole and sleeve - I pressed with a lot of force then decided it was not going to go, and had trouble getting it out again.
Here is what I did in the end:
1. Lubed the hole
2. Clean out the hole with a (cheap imitation of a) Dremmel using a long thin cylindrical grinding stone (actually a chain saw sharpening stone very appx 6 X 20 mm).
3. Relubricated and fitted the lubricated sleeve
4. Tried sensor for fit
5. Repeated 1 -4 until happy
It went in with what seems just the right amount of force in the end and should come out easily enough but not of its own accord.
Sealing with silicone sealant as mentioned above would be silly as the other end of the hole does not have much protection, so I used WAXOYL which I've developed great confidence in over the years for everything from halting rust and lubricating fittings to seating tubeless tyres. Waxoyl is the afore mentioned lubricant and I put at much as I could under the rubber gasket as well.
SLEEVES
Even after 9 years they were reuseable - at least I speedily decided they were on inquiring about the price of new ones. When removing in the first instance, be aware they are split down their length so inserting a knife or thin screwdriver at the right place allows them to be curled up like a roll of paper - just slightly but enough to get them out easily.
NEW SENSORS
(part number 8D0927803D) were £13.99 plus p on Ebay and if it wasn't for the price I'd think they were OEM. Perhaps they still are. I should've ordered them before the job. Fitting was easy but required taping the connectors (- one to a draw string and the brake pad one to the main cable) to get it up through the hub whateveritscalled casting that is the route. The sensor end wouldn't go through.
grover
17-03-2010, 12:45 PM
Top write up/feedback fella!
Cheers
Tom
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