Originally Posted by
klroger
Hey Strawboss, I don't think the rings are magnetic, I think the sensor has the magnetic part in it & the toothed part of the ring passing the sensor is what sets up the frequency that the module sees to determine the wheel speed. If there is a crack in the ring that makes the distance between a couple of the teeth of the ring different from the rest, it will see that as the wheel stopping before others when slowing down. At least that was the way the system worked when I was on the wrenches a few years ago... Might be different now tho... Dunno...
The ring you may be thinking of is like the ring that was used on my Smart fortwo, a castellated arrangement.
The ring used in the Mirage is smooth.
I noticed some black powder adhering to the ring must be the metal worn off of the drum by the friction material, hence my conclusion the ring is a magnet.I believe the sensor that reads the ring is called a Hall Effect sensor.
Here's a photo....before cleaning I could see the pattern of magnetic "teeth" where the iron filings stuck to the ring, a neat effect.
Last edited by strawboss; 11-07-2023 at 02:36 AM.
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View my fuel log 2015 Mirage ES Plus 1.2 automatic: 38.0 mpg (US) ... 16.1 km/L ... 6.2 L/100 km ... 45.6 mpg (Imp)