Rear ABS Reluctor Ring - Mitsubishi Lancer Evolution 10 X CZ4A

Many ABS Reluctor Rings have poor corrosion protection applied when manufactured.
The symptom of a flashing or permanent ABS Light being shown on the dash is a common sign of the reluctor ring at fault and not the sensor.
However the main cause can be the CV Joint and reluctor ring rusting between the surfaces forcing the reluctor ring to expand and crack/break.
This can also cause damage to the sensor.
When fitting this remember to remove every trace of rust from the CV joint mating surface and grease the area to stop the same problem in the future.