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Rear ABS rings on S2 #612071
11/01/20 12:12 PM
11/01/20 12:12 PM
Joined: Mar 2009
Posts: 6,661
Alistair Offline OP
Smile, it confuses them
Alistair  Offline OP
Smile, it confuses them
Talk Morgan Sage

Joined: Mar 2009
Posts: 6,661
I was reminded by another PlusSix thread about a conversation during the last MoT and thought it might be worth sharing on the Aero thread.

I had been hearing what sounded like a ting-ting-ting noise from the back end which was road speed related. Not loud and sounding like metal clicking against metal. I wondered if it was something related to the handbrake as they are always an interesting optional extra !

During the last MoT the engineer pointed out that the ABS sensors on the back wheels use metal rings which are around the back of the hub/half-shaft. These are like a large toothed ring and have high/low islands which is what passes the sensor and generates the pulses the braincells read for road speed.

These rings can corrode, swell or warp over time. I was told they are from a 1Series BMW and this car is known for the same problem. It is not a huge problem swapping them however I think you do have to take the halfshaft out and take thm off in the direction of the diff not the wheel but I may have remembered that incorrectly.

If you have the car up in the air it is worth looking at the sensor rings on the back axle.

Just time to burn a little more petrol before dinner.
Re: Rear ABS rings on S2 [Re: Alistair] #612093
11/01/20 03:08 PM
11/01/20 03:08 PM
Joined: Aug 2013
Posts: 12,113
Salisbury, UK
Peter J Offline
Formerly known as Aldermog
Peter J  Offline
Formerly known as Aldermog
Member of the Inner Circle

Joined: Aug 2013
Posts: 12,113
Salisbury, UK
Interesting: are they the same on all versions of the Aero, I wonder?
If the half shaft has to be removed from the diff then it would make sense to do that when the LSD fluid has to be changed.
Something for November, I think, when the next service is due.

Tarka the 'Otter Mog
2014 Plus 8

Re: Rear ABS rings on S2 [Re: Alistair] #612175
12/01/20 11:47 AM
12/01/20 11:47 AM
Joined: Jul 2014
Posts: 1,341
Newcastle Upon Tyne
James B W Offline
Has a lot to Say!
James B W  Offline
Has a lot to Say!

Joined: Jul 2014
Posts: 1,341
Newcastle Upon Tyne
- just had these replaced on the little Smart car - like the BMW, it's a known problem.

Mine had a small crack in the ring.In normal use this was not a problem.

When the weather was freezing ,the water in the crack froze and expanded and threw up the ABS light.

New rings were cheap (about £20...) but the shafts had to be released ,all the rust/crud cleaned off and new rings slid into place.

I understand that the rings used to be interference fit and had to be heated before installing.Now they are just large enough to slide on and are then secured with a little Araldite or similar. innocent

Mercedes (Smart) want several hundred pounds for complete shafts and ABS rings..... swear


Aero8 , Series 1 - Boston Green
Range Rover Evoque S
Smart Brabus Convertible

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