Have a late model (I have a '97 Chevy) GM or Ford 4WD truck with ABS? Ever have the ABS kick as you slowly come to a stop? I just googled it. It's a known issue with the ABS sensors. GM and Ford used a Kelsey Hayes hub with a built in ABS trigger wheel. The hub itself isn't the issue, how the sensor is mounted is. Rust builds up on the knuckle and lifts the sensor away from the ring. This makes the signal very weak at low speeds. The signal looks like the wheel just stopped and you get an ABS event.

Fix (for now) is to remove the sensors, clean the mounting surface, and reassemble. Supposedly NHSTA is looking into it for a recall. Couldn't verify that. In the meantime, thought I'd share here, it can be spooky when you're towing, luckily it hasn't gotten REAL spooky for me.

Tim.