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Early ABS sensor fix by Committee/928 Community

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Old 12-06-2017, 10:36 AM
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ROG100
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Default Early ABS sensor fix by Committee/928 Community

Background - 84 to 85 ROW 16v & USA 32v 85 to 86 early cars with the optional ABS system have a different sensor setup to the later style.
The early sensors have been NLA for a few years now ( I have searched the World to find them with no success) and the issue is becoming critical in that many of these cars do not have working ABS systems.

We have a plethora of experts in the 928 community with the required skills to overcome this problem. I am willing to inject time, resources and money to this project in an effort to overcome the problem.

The early ABS system seems to be reliable but the Achilles heal is the sensors. They degrade, wires, connectors and sensors suffer failure.

John Madden did an excellent write up on how to repaire an existing sensor --

https://rennlist.com/forums/928-foru...d-sensors.html

How do we find a cost effective alternative to fit the current system?

I have a set of front and rear hubs/axles from an 85 ROW car along with the ABS brain.

Alan, Doc Mirror - what do we need to do to make this work. Is it all about the fit of the sensor or?
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Old 12-06-2017, 10:49 AM
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I would be a customer for these if available. '85 Euro S2 16v 4.7.
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Old 12-06-2017, 07:48 PM
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Bump - anyone??
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Old 12-06-2017, 07:55 PM
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if a mount adapter is fabricated and the newer sensors are mounted & connected do they work? I noticed that the newer sensors are longer. What is the diameter of both? How far away are both from the spinning teeth on the hub?
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Old 12-06-2017, 07:56 PM
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what is the impedance of the factory ones available vs the NLA ones?
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Old 12-06-2017, 08:07 PM
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From what I have been told so far the sensors of the same era are the same apart from fit. If we can define the dimensions of the port for the early v the size of the later sensor that could be a good starting point.
One of my initial concerns is to source a readily available sensor to move forward. No point in going to all the trouble to accommodate a sensor that also goes NLA in a couple of years.
Someone on FB suggested a BMW sensor which certainly looks like to original and may work but I could only find one available from all the wholesalers.
I will work on the port dimensions as a starter.

Thanks for your interest in the project Sterling.
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Old 12-06-2017, 08:48 PM
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Does this mean we should also be looking at other sensors that are the same as the early and late versions?
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Old 12-07-2017, 08:57 AM
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Last night I ordered a Bosch replacement (part #92860640201) that said on numerous supplier sites would work. I will let you guys know how it goes. There was also another manufacturer of the same part, Standard Engine Performance.
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Old 12-07-2017, 09:13 AM
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Last night I ordered a Bosch replacement (part #92860640201) that said on numerous supplier sites would work. I will let you guys know how it goes. There was also another manufacturer of the same part, Standard Engine Performance.
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Old 12-07-2017, 02:42 PM
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928 606 402 01 is the sensor you already bought and as we have all told you is for USA 86.5 to 95 cars and fits the rear. If your car is really an early 86 then this sensor WILL not fit.
Good luck.
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Old 12-07-2017, 02:48 PM
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Originally Posted by ROG100 View Post
928 606 402 01 is the sensor you already bought and as we have all told you is for USA 86.5 to 95 cars and fits the rear. If your car is really an early 86 then this sensor WILL not fit.
Good luck.
So I assume you have tried this sensor before Roger?
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Old 12-07-2017, 03:20 PM
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Yes and it does not work on the early cars. It is the same one you bought from Pelican and showed on FB.
Are you sure you have an early 86?

I am looking at early sensors for all cars in the 80's to see if I can find something that is a closer potential fit - but equally has a good supply and can sustain the need of the 928 for a few years.
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Old 12-07-2017, 03:33 PM
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As Bosch seem to stop making many components after 20 years or so (e.g. the 968 MAF) then a replacement ABS sensor from a modern car seems a good strategy.
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Old 12-07-2017, 06:50 PM
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Roger,
Can we get somebody to post some up close pictures of the correct ABS sensors? I've got no dog in this hunt, but I don't mind helping look.
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Old 12-08-2017, 08:37 AM
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Originally Posted by 928sg View Post
what is the impedance of the factory ones available vs the NLA ones?
when I tested the used sensor I had it measured the same as the original ones. Basically 1000 ohms.
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