Just before the car comes to a complete stop the brake pedal drops about 1/2" and the pedal starts vibrating. I also hear a buzzing from the ABS area and I can feel it in the pedal. If I drive slowly say less than 5 mph and brake slowly sometime I get this effect and some times I don't But if get up to 50 mph and then brake as the car just before it stops I get the buzzing effect.