A quick brake question…

My 2wd saff had a problem, where the pump was not getting a feed, basically the fuse box was melted and generally buggered! I’ve changed the loom, put new relays in for the abs, now I have brakes again but the abs light still stays lit up on the dash? Can anyone tell me how to check the sensors (this is the first car I’ve had with abs so I’m a complete novice to these systems and how they work so an idiot proof explanation would be handy ) or any other ideas to what it could be

CheeRS