ABS reluctor ring - where to buy?

I might have a case of a broken ABS reluctor ring (not confirmed yet). If I need to replace it, where can I get a hold of a new one?

https://www.reluctorrings.com Bought a front one from them about a month ago. Good quality, good fit.

Thanks! Did you have to heat yours when installing?

I heated it up with a crappy butane blow torch so it probably didn't give too much expansion. Used a drill wire brush to clean up the surface on the end of the CV, applied a tiny smear of grease and gently tapped it on using a drift. It was an easy job. Took about 10 minutes including removing the old one which in my case was just badly corroded rather than split.

Thanks again! The ABS/PSM started to act up just before I put the car away last year. No lights, just interferrence when braking or turning. I haven't had the chance to hook up any diagnostics equipment yet, but did a visual inspection of the front reluctor rings. Although they appear be intact, they also look badly corroded - hence the suspicion. I guess it is enough to affect the system if one of the "teeth" are chipped or broken?

It's a simple system reading a binary signal from the ring 1010101010 based on the highs and lows on the ring. If the wheel locks up it reads a constant 1 or 0 so it knows it's locked which activates the system. If the ring is corroded or split the gaps aren't even which means you get the system pulsing as it will read something like 10101001010100 where the split causes a larger gap or the corrosion forms a wider high point.

I guess the system is quite prone to failure as the reluctor rings do get a fair bit of elemental exposure. Apparently, no shops in Norway are able to provide rings without a complete driveshaft, so I'll follow in your footsteps and order from reluctorrings.com. I pray I'll have the parcel before winter :roll: :mrgreen:

I replaced one of the reluctor rings last night, as the old one was indeed cracked. Sadly, it didn't solve the problem with the ABS interfering now and then during "normal" braking as well as the PSM kicking in for no apparent reason. I know the other ring is just as badly corroded as the one I just removed, but I'm hard pressed to believe both rings failed simultaneously. Maybe I'll just go ahead and replace the other ring as well since I ordered two of them.

Just bought one off eBay for £7.99. Looks decent enough.

That is quite a bit cheaper than the ones I got from reluctorrings.com. £70 + shipping and taxes is still pretty far away from an estimated £1000ish or more for new drive shafts from Porsche :mrgreen:

https://www.ebay.co.uk/itm/201034990016 2nd one I've bought now (the original on the otherside failed).

Added to my Watch list Tonight I'll try and measure the resistance of the ABS-sensors on the rear axle, as well as to do a visual inspection of the reluctor rings.

Both jobs easy enough to do. Youll need a torch.

The rear rings are cheap and easy to get as they are common to other cars (Mercedes for one). The correct C4 front rings I could only find on the link I posted earlier. Some places on eBay do list the C4 front rings but they are rear rings wrongly listed.

Yes, I've noticed that the rear rings seem to be easier to get a hold of. I did get the front rings from the link you posted, they were a perfect match. Alex: Thanks, I'll keep that in mind!