First, check your fluid level.
Second, go back and count the teeth on the ABS tone rings on the two axles. If they have a different # of teeth, you have the wrong axle. If they are the same, check the gap between the abs sensors and the tone rings, if they are too far apart, you can get an intermittant signal.
If none of that helps, then get the ABS codes pulled to check for a potentially faulty sensor.
and epattonm, you are ridiculously ignorant. Just because its too complicated for you to understand doesn't mean ABS is a bad thing.