Gibbicr

After 2 sets of discs (warping), pads, a new caliper, hub and bearing...my GS now has a disconcerting ABS problem. At low speed, under braking with about 1 turn of left hand lock, the ABS cuts in. It doesn't do it any other steering position or speed. The codes indicate the main ABS unit has a problem (££££) - but it only started after I had the new hub and bearing. Could it be damage to the sensor instead....