Can have a shop hook up scanner that reads the sensors make sure they are all functioning. There is something not reading your speed correctly in your system. Causing the abs to think your locked up when you are still rolling. It will pulse the brakes. I lived with this issue on and off for a few years and had a few bad situations but no accidents because of it. My last time trying to fix it, after a mechanic replacing a sensor and saying it was good, I cleaned the connectors for the sensors up in the fender too. With electric cleaner. Anything to help them function. And have not had it happen in about 8 months.
