ok so my replacement hubs fixed my road noise hum, but now my abs is either over active when slowing down below 20mph or my abs light comes on and i stop normally, but i think my abs goes inactive. and this all started when i replaced the driver's hub. both hubs came with new speed sensors. so what i did was i swapped in the old speed sensor after looking at the reluctor ring inside to make sure there wasn't any issues with the reluctor ring. but i did notice a couple of things. one, there was alot of grease in the old driver's hub, or at least on the teeth of the ring and there was only a small amount on the new one, could this be an issue? second i noticed that there was what looked like a couple of shims under the new sensor. when i swapped the sensor out with the old one, i reinstalled the shims. could this also be an issue? i think my first step here is going to be removing the shims, after measuring the distance from the mounting surface to the top of the teeth on the reluctor ring. and there was no change when i swapped out the new sensor with the old sensor