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Old 20th June 2018, 10:23   #1
p2roverman
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Default ABS sensor removal

Tips on removing a seized front ABS sensor, please.
Snapped off flush with the hub, but wires not broken.
Do I drill down the side with a small drill, or use a big drill down the middle?
What depth to drill is safe? But if the tranductor ring is enclosed within the bearing surely it cannot be damaged?
What about swarf and rust going down the hole?
Suggestions to prevent the new sensor seizing in the hole?

I'm sure these points have been raised on the forum before, but I've been unsucessful in searching for answers.
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Old 20th June 2018, 10:38   #2
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The bearing can and is very often damaged. I have done it a few times with a big drill and not going very deep, I can't give exact mm depth put proceed with extreme caution and take your time and you should be ok.


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Old 20th June 2018, 10:52   #3
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Try drilling a small hole down the middle (3mm drill bit) then screw in a wood screw , and see if you can prise it out with the claw of a hammer.

Pete
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Old 20th June 2018, 10:53   #4
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On the other points, get the hoover on the hole after and give it a good clean up. I have always fitted cheap replacement ABS, SKV? I think and they have never failed. The new ones are a very tight fit, I have used the thinest of smears of copper slip and took a craft knife to the plastic lugs on side to shave a tiny bit off to aid fitting. Some may cry that the copper slip and swarf will destroy the reading, but it has worked for me and if you are cautious it should be fine.

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Old 20th June 2018, 10:56   #5
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HI Mike.
Drill down the centre with a 3mm drill about 15mm then screw in a self taper with flat head you will then have a chance to pry it out with a pry bar or claw hammer.

Clean any dirt and rust around then sensor before hand, also hoover any debris as you drill good luck Arctic

Pete be me to it

PS as above slice off the little tags to help refitting easy smear of copper slip but not at the business end of the sensor, the bolt will hold it steady after fitting.
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Old 20th June 2018, 10:59   #6
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This may also help, but arctics post seems to have it covered.😄
Front Abs sensor... how tight?
https://r.tapatalk.com/shareLink?sha...1&share_type=t


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Old 20th June 2018, 11:16   #7
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Thank you all, guys, for your comments. And of course the links to the various other posts I wa searching for.

Hopefully I'll have no problems now. My pscan informed me the sensor was open circuit, (the car's ABS test failing the static test). Plugged in a new DMGRS one which I understand to be genuine, but will now check having seen comparison photos on another post, and the static test then passed.

I'll report on progress but not today as it's raining. Currently using my backup £130 Connie SE so there's no rush.
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Old 21st June 2018, 17:26   #8
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It's out, I'll mention how later.

BUT Why is there concern over damaging the traductor ring when drilling out the sensor. Looking through the hole it is the drive shaft I can see turning, while the traductor ring is inside th bearing and not in line with the drill bit should one drill all the way through. Comments?

Incidently, which end of the bearing has the ring (I bought one in case of need)

Removing the sensor was a pain. Following advice I tried to pull it out with a screw down a drilled hole in the middle, the screw thread just pulled out the newly created thread in the plastic. Eventually I drilled down an inch with a 31/64" drill, and drilled a small hole right into the coil? section at the bottom for the extraction screw - it would not move. With several small holes drilled aroung the side it eventually came free.

Any preparation before fitting the replacement? - I'm thinking a thin screwdriver blade down the hole to scrape rust off the driveshaft, and perhaps a tiny brush or pie-cleaner to clean whatever can be reach of the bearing face and seal which has the traductor ring underneath.
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Old 22nd June 2018, 04:30   #9
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Hi Mike.
Be careful what you poke into the sensor hole, as any debris left behind even bits of rust can and will effect the magnetic ring, below are some photo's that I took when a member had drilled his sensor out, successfully and at first it cured the ABS light, but after a week the light came back on but this time he had the pulsing of the brake pedal.

We decided that a minute bit of the old sensor may have been left behind and damaged the magnetic ring.

I had a spare hub which we knew was a working one, therefore we made plans to change it over.

donor hub.
1

2

3

As you can see it is clean it was brushed out with a soft brush and also hovered so free of any rust particles.

The next day we remove troubling hub and magnetic ring, note how the ring as been worn by the debris.

4

5

6
You can clearly see the black protective membrane as been worn away so it is now showing the metal colour.

The donor one was fitted and is to this day still working fine, so yes bits can drop in and do damage best to be clean Arctic
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Last edited by Arctic; 22nd June 2018 at 04:34.. Reason: Photo editing
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Old 22nd June 2018, 15:59   #10
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Quote:
Originally Posted by Arctic View Post
Hi Mike.
Be careful what you poke into the sensor hole, as any debris left behind even bits of rust can and will effect the magnetic ring, below are some photo's that I took when a member had drilled his sensor out, successfully and at first it cured the ABS light, but after a week the light came back on but this time he had the pulsing of the brake pedal.

We decided that a minute bit of the old sensor may have been left behind and damaged the magnetic ring.

I had a spare hub which we knew was a working one, therefore we made plans to change it over.

donor hub.
1

2

3

As you can see it is clean it was brushed out with a soft brush and also hovered so free of any rust particles.

The next day we remove troubling hub and magnetic ring, note how the ring as been worn by the debris.

4

5

6
You can clearly see the black protective membrane as been worn away so it is now showing the metal colour.

The donor one was fitted and is to this day still working fine, so yes bits can drop in and do damage best to be clean Arctic
Thanks Artic.
These photos are exactly what I needed to see the relationship between the sensor and ring. It's impossible to see this when the assembly is on the car.
Following your advice I will go in carefully with a pipe-cleaner to try to remove any debris, and hope that my poking about yesterday has not damaged the ring.
Reading the manual it appear that one can only replace the bearing if the whole of front hub (and suspension ?) is removed from the car and taken to the bench, an operation I hope I don't have to do.
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