My wife has a 53 plate RIO LX recently the abs light comes on after driving 9 or 10 miles. I check the reluctor rings and they seem ok, cleaned them with a dremel tool using a small wire brush. After a test drive it came on again after a couple of miles. There seems no ryhme or reason as to it coming on. During the test drive I stopped switched off restarted the car and drove home and it never came on. Any help would be appreciated.