did you check for a blown fuse before you started. i had same problem and i traced it to a blown fuse, £1.00 to fix it.
firestarter, September 2012
if the bearings were changed to cure the problem you have now started on an expensive runway. the abs is all elrctronic the quickest and most cost effective way is to put it on a diagnostick computer at a garage or auto electrician and you will have your answer to cure the fault within half an hour.it will most likely be awheel cencor.brocken wire, or abad connection.
rab., September 2012
have you reset air gap on sensors?
k, September 2012
have you put the bearing in the right way round?
cdc, September 2012
then you have either not connected the wires to the brakes,or you have damaged them vauxhall electrics are crap