I have an E Class CDI 220 - There is an intermittent fault on the the cruise control which I can't fix. Some days it works faultlessly and other days it won't work at all. It never fails in operation. Sometimes simply stopping, waiting and then starting againn seems to do the trick. The only fault showing in the brain was a faulty brake light switrch and I have replaed that to no effect. Anyone any ideas please.
Wilby