You should jump the ABS relay if the ABS motor does not turn on try tapping with a hammer handle.If the motor responds remove the motor just two screws and take to a auto electric shop for new brushes.You may have to try several before finding one willing to do the job.Their are other post on this website with pictures and more detailed info.I think i found them with a search of ABS BAS AND STR LIGHTS ON ML GOOD LUCK.