Hello all,

In the process of a major to-do list week I was removing my ABS sensors for cleaning. Fronts out and clean no problem, but I had a bitch of a time with the left rear. It just would not budge. I soaked it with pen oil over night and tried again. More effort, more oil, and I managed to puncher the side of the top of the ABS sensor cylinder with a pry implement, so with it butchered I went at it with gusto.

Well it separated. The butchered top is off, but the main body of the cylinder is lodged in the hub. EXPLETIVE! EXPLETIVE! EXPLETIVE!

Now my options are:

Try to get what is left of the ABS sensor out of the hub. I think this is a lost cause. At least while the rear hub is on the car. Even then, I will probably score up the hole of the ABS sensor when the remains are removed.

Get a used hub, preferably with the ABS sensor removed so I can install a good unit. I have access to a lot of 928 parts, so a used hub would be accessible. I hope the price is not to steep . If the only used hub I can get has the ABS sensor in it, should I try to get it out for cleaning? BTDT

Anyone been here before???

If I have to take the hub off, is there any instructions? To get the large nut (25mm?) off the CV axle, do I just torque it off, or is there anything I do to not damage the transmission?

Sorry for all the questions, but this ABS sensor has sent me down the rabbit hole.

Cheers,
Michael

 

Hi the best way to get the nut off is with the car on the ground remove the center cap of the wheel then put the socket on the bolt and with a big breaker bar lossen it up, or you can use a impact gun, if you remove the hub from the housing then your also looking at replacing the wheel bearing, any chance you could get a drill and carefully drill out the innards of the abs sensor then try working the housing out, put a piece of tape on the drill bit to mark max depth so you dont drill into the ABS ring

 

Hey Mike,
Ain't fixin' things fun ....
To further fix this, I'd be very tempted to drag out the Dremel and a handful of bits - and perhaps a flex drive. As you have already removed one sensor, you know how far you can excavate.
The sensor is little more than a steel rod (ferrite core) wrapped in two gazillion turns of fine copper wire .... all stuffed in a tin cup that is seized to the hub. It should be reasonably easy to cut enough of that away to allow the rest to be pulled out with needle nose pliers. The tin can can be split with a small cold chisel and twisted out.
Much easier than hub replacement .... have ( more) fun.

BTW, don't worry about scoreing the well in the hub: a swipe of JB weld will cure any concerns - and the sensor is depth sensitive: radial location is secondary .... even I couldnt screw up the well that much to bother it

 

Hello Merlin,

Thanks for the tip on dropping the car on its rear wheels, and then getting the axle nut off (I think it is 31 or 33mm). I should only have to remove the whole hub assy (carrier, and hub), and not separate the bearing. We will see.

Hello Garth,

Well I have been having a lot of fun, up to this point. Not sure if drilling out the remains is an option. The sensor separated at the top, and what is left is the metal cylinder spun in wire. It is a large piece that just about fills the whole ABS sensor cylinder. I can’t pry it out, and it looks like far too much metal to drill out I will try to get a picture.

I would already be off to check on getting a replacement hub, but I’m waiting on UPS to deliver a new wheel. I bent a rim last week UPS blows…..

Thanks for the input guys, anything else is greatly appreciated. I will update later today.

Cheers,
Michael

 

Mike ... pics please.

 

Split the difference .... the axle nut is 32mm, or 1 1/4".
For my $ 0.02, a dental style burr would go through that copper like hot butter: I had the same issue on an Audi Quattro once, and you know they are more difficult than a 928

 

OK, so with Garth, and Merlin’s encouragement, I gave the drill a go.

I did manage to get the remnants of the rear left sensor out just fine. The aluminum casing was really corroded. I cleaned up the hole. I had to give the inside of the hole a good clean with the dremmil. There was aluminum corrosion all throughout.

So no rear hub assy for me.

Here are some pics…

Front ABS sensors, nice and clean. These were an easy pull.



Destroyed rear ABS sensor……Bi-atch!



Here is the cleaned rear ABS sensor hole. I had to put one of my refinished calipers on to ease my frustration. They really came out nice. They are not done yet. I still have sand down the “PORSCHE”, and fully assemble them.





Paint is VHT high temp caliper paint “racing red”. Baked in our new Jenn-air (wife is out of town).





Here is my HID units. I have not installed them yet, but just plugged them in. They are fab!



Finally here is the pain in my other but cheek. This is my new spacer (needed to bring my wheels out to fill the gaping caverns of my new GTS quarters) I am using until I get my new wheels.



90 ft/lbs of torque on the studs, drove the car 4 times, and one of the studs cracked! Junk! I will be getting 2 used front hub assys today and get the factory studs pressed out, and then pressed into these spacers. That’s the plan now anyway. I will post on this issue later.

Still waiting for the UPS guy with my new wheel! Ca-mon man.....stuff to do...stuff to do!

Thanks guys,
Michael

 

Hi Everyone,

How deep does one drill into the top of the sensor to get it out? Also can anyone recommend a diameter? I'm going to try and tackle this soon, and if PlusGas + heat doesn't work I'll have to drill 'em out!

Cheers!