Hi All, I have had the ABS light come on intermittantly on my D1 300tdi and the blink test showed air gap in front right, so I pulled it out, cleaned and refitted and tapped in gently, however when I now come to brake on a normal road, dry, at less than 15mph the ABS kicks in with pulsing through the pedal, but doesnt always do it, does anyone have any idea what this could be please?