I had problems with my ABS a while ago, It has since come good, I put it down to water had gotten into the unit somewhere as the inner guard liner on the left side has a hole worn in it as it seemed to only play up in wet weather. It would seem as if the unit was contantly running and made the battery go flat a few times. Mitsubishi should be able to attach it to a scan tool that will show up codes relating to the problem area, I don't kno if removing the battery for 15mins or so resets the ECU etc in these cars or not.