Having brake problems. Please help. Thank you!

I dont know what youre looking at, but thats not the sensor. Its behind the drum on the other side

 

I’m aware of that… I just wanted to show this picture to see if there’s a issue with the brakes or cylinder also… or if the issue I’m having caused this.

 

Oil on sensor you got axle seal leaking

 

That is a possibility.
However, it could be grease from the bearing.
When grease gets warm/hot or worn. It can get thin.
You’ll see this on worn front wheel bearings too.

When my axle seal leaked, it LEAKED.
It stunk, and it flung all over the fender well and cover the drum brakes.
Never did throw a code.

I’m going to go with a failed bearing/ABS pickup ring, like others have stated.