Isuzu ABS is really noisy when it operates. Mine rarely ever activates, even when offroading on very loose stuff.
The safety campain (02I-002) addressed in service bullitin SB03-09-S001D applies to all '98 and '99 rodeos. If you dont know if yours has been done call an isuzu dealer and the will check the VIN to see if its been done. If not you can take it in to have the controller replaced. Took them about 10-15 minutes to do mine.