[Shelli]

I have had an ongoing problem with my 98 cavalier for about 6 months now. The brake pulsates bad at times. It is at random. The rotors and brakes have been looked at by three different shops including the dealership and nothing can be found wrong with it. I know the ABS system tends to do this but the service manager at the dealership had told me that it is unusual to feel the pulsations that often. It is very noticable when riding the brake to slowly pull into a parking place. Also, three different times I have had it skid on me and the car starts shaking violently and makes a roaring sound and then it is fine again. Could it be a problem with an ABS sensor? It is not making any weird noises and no indicator lights have come on. Any suggestions is greatly appreciated...Thanks!!!