Wheel Locking Up (ABS Light ON)

My car's ABS light has been on since I bought it over seven months ago and I havent had a problem until recently.

I noticed on wet roads, sandy roads, or in emergency-stop situations my Rear, Right brake will lock up. On slippy surfaces it barely takes any effort to do this, and it's only that wheel.

Should I replace the hub ABS bearing?

The ABS doesn't work (at least I've never noticed it working) and I don't know if it's because of this hub sensor fouling causing the whole system to not work...

Does anyone know how to check this without bringing it to a dealer?

Where do I look to see if the computer is throwing a code?

Thanks a lot!

Dan

You need to get this on an abs function scanner look at the codes, check comparative wheel speed inputs for a possible bad wheel speed sensor.

So... basically spend the 80 bucks for a dealer to check it out...

Dan