My power steering pump makes that sound. And, the power steering pump is in the general vicinity of the ABS thingy. With mine, if I start the car with the hood open, I can hear it. Then if I turn the steering wheel at all, it goes away. I'm not sure if this is an indication of a bad PS pump, but I'm really not worried about it (and no, it's not my o-ring. I recently replaced that with OEM).
|