At random times the following happens all at once to my 1996 C220 with low kms, the Speedometer stops and the 3 brake warning lights come on ( brake pads, ABS and handbrake). This problem is random and sometimes wont happen for days, other times it lasts a few seconds other times its lasts a few hrs.

I have checked out all the brake warning lights and have confirmed that there are no issues with the brakes.

It is difficult driving when the Speedo suddenly stops. Does anyone have any ideas what the problem could be? Any help would be much appreciated.