An abs sensor, can get metal shavings stuck to it, can brake clean, but normally if you have a fault it needs to be replaced.
they forgot to put the ABS ring back on after removing the axle.
abs sensors are at the axle hub
An abs rotor could be heavier duty, and could have a tone ring for a speed sensor to read off of.
ABS stands for Anti-Lock Brake System. If the ABS light is on, your ABS has a problem. Clean all wheel sensors of any debris. If that does not help, Seek out a professional for this repair.
Could be a broken ABS sensor ring at one of the wheels
On some cars, the abs sensors may read off of a tone ring on the cv joint.
You need to keep the belly ring clean. You should also twist it. You need to use alcohol to clean the outside of the ring and skin.
Rust built up (where the front wheel speed sensors insert into the hub) raises the sensor away from the tone ring causing a change in the air gap. This sends a bad signal to the ABS module. The ABS module thinks the wheel is locked up and then activates the ABS. I have seen this in GM trucks and Ford trucks. Remove the wheel speed sensor, clean area of flaking rust then reinstall sensor.
Bring to a shop that has an ABS scanner to determine problem. It can be many things including wheel sensors, ABS pump, or bent ABS ring located on your CV axle or rear hub assembly.
its a pickup sensor on the rear of gearbox and runs of a reluctor ring in the box same as a abs sensor ring
To effectively clean a tantalum ring, mix mild soap with warm water and gently scrub the ring using a soft-bristled brush. Rinse the ring thoroughly with clean water and dry it with a soft cloth. Avoid using harsh chemicals or abrasive materials that could damage the ring's surface.