If I am on a rough, bumpy or uneven road; especially one that is somewhat steep and I am doing about 30mph downward or sometimes straight and apply the brakes. The x type 3.0 abs will pulse and seem like the car started going a little faster at first. This is when it is dry outside and it is really scary because I feel like I get closer to hitting something. I have never noticed the above on any other car with abs; even a different model jag that I had owned. Please help