I was doing some brake work and got air into the ABS, my local tire shop had a ABS bleeder tool, took about 5 minutes to hook it up, run it and out the door. They did it twice but it still did not feel right, like just 1 air bubble stuck in the ABS unit. I took the car out on a rainy day and did a few full panic ABS pulsating stops at slow speeds, took care of the problem. Might be worth a try???