As MM said, they are a sealed unit. No disassembly, no maintenance. Just replace.
I got mine from Rockauto recently. They came with the wheel speed sensors included. It was a very tight fit to get the longer ones I have fitted into them. But I guess it means they are less likely to get water into the tone gear that way.
Never seen a replacement come without the WSS....( but anythings possible ) as they frequently get eaten when the bearing starts to get loose.
One brand I struck was actually a different diameter sensor which meant you HAD to use it - you had to fight with the plug/socket on the back of the tower - yuck !
If you've caught the bearing before it eats the sensor just use the old sensor... saves a LOT of dicking around.
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It seemed like a good idea at the time........
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front wheel bearings query
