Abs codes c1230 and c1102

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2000 Ford Explorer XLT 4.0 SOHC

ABS Codes: c1230 and 1102

I changed the rear sensor on top of the differential and light is still on.
I checked the voltage coming off the harness it was at .35

A couple questions...

I have rear disc brakes, does this mean i have a sensor on each rear wheel?

Would a front caliper or anything else on the front cause these codes?

The abs light first came on when i slammed into a pothole, I changed all brakepads and there was uneven wear on the right front..seems like the one side of the pistons is not engaging. that is why i ask about the caliphers.

 

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OK so i noticed this hose clipped to the top of my spare tire well dangling and after further investigation come to realize this is my vent tube that was broken off with buildup around it on the axle, gear oil maybe? just put the hose back on it and i might need some gear oil now. ABS light still on.

Would low diff fluid cause an abs light?