Hi guys can any1 help me my abs light turns on for a second when I switch on my ignition on before I start the car, and it also lights up for around to seconds when I go to turn her off....its got me a bit worried cause the other day I was driving and I went apply my brakes to turn right and it felt as though my abs had a spack attack ,I felt my foot on the brakes vibrate crazy.....can any1 help me and tell what I should check or what I need to replace?