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Never having seen this particular cars ABS sensor setup I cannot say for sure. It sounds like the ABS encoder. The manual fails to show this setup. The ABS system would have an encoder ring with notches, marks, etc around the circumference. There is a stationary ABS pickup sensor that picks up these marks, notches as they pass by. The sensor sends an electrical pulse to the ABS computer. One pulse per mark, notch, etc.
Find the stationary sensor, and determine what moving part on the axle lines up with it.
I am guessing the axle hub is a sealed bearing and has an O-ring that fits between the hub and backing plate. On cars with rear drum brakes, high temp white grease might be used on the parking brake adjustment mechanism.
Can’t say what effect greasing the rotating encoder will have on ABS performance. If you did grease the sensor, try to clean off it off. Make sure that grease did not fly off the encoder and onto the stationary pickup sensor. This might affect ABS performance.
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