- Jul 8, 2012
- Dickson, TN.
This issue started in November with the ABS/Brake warning lights illuminating. I have a thread on that issue HERE but I wanted to start a new thread about this, in hopes that more people will read it, and also hopefully it'll come up in search results in the future, when somebody else has this problem. Anyway, I pulled the left rear wheel speed sensor, and, it did look a little funny, but, initially I didn't look too hard at it. Put the new sensor in, warning lamps blinked out, and all was good...until a day later on my way to work, when they came back on. I pulled the new one that I had installed, and obviously something inside the hub was making contact with it - enough to wear all the way through the outer plastic housing, to the point where the copper internals are showing. I called a local independent shop, and they said it almost has to be the ABS reluctor ring (looks like a gear on the axle shaft - this is what provides the wheel speed input to the sensor). His guess was that the ring has somehow come loose and is now making contact with the sensor. I was already planning to go on and change the wheel bearings/housings, as well as the seals (gear oil is not showing - yet - on the outside of the drums, axles, or wheels, but the wheel speed sensors have gear oil on them when I pull them out). My question is, who's seen this before? What's going on here? My plan is to pull the axles and have a local machine shop press the old wheel bearings and components off the axle shafts (I don't have the necessary press, nor do I have room in my small garage for one), and press the new components on, then re-assemble everything myself. I was just wondering if anyone's seen this, especially on a Tacoma, 4Runner or similar Toyota, and has gone through this before. Goal is to do this right the first time and avoid a rework due to leaking again, so, just wanting to arm myself with as much information as possible. Here are photos of wheel speed sensors. Upper left is original, OEM sensor. Upper right is the new (eBay) sensor. You can tell that the original sensor was being rubbed, but the new one got rubbed much worse. Bottom one is a new (RH side) sensor, for comparison.