Recently my 1993 400E has had its light to the right of the red parking BRAKE light in the dash been blinking and occasionally stays lit. It is the orange light with a circle of little dashes. It mainly flickers with my foot on the brake but sometimes flickers when it is not. Also, once it a while the light stays on solid for a few seconds, usually my foot on the brake. Does anyone out there know what sort of brakes issue I am looking at? Is it a pad indicator or a fluid sensor? Please let me know what this might be and what possible remedies are available. Thanks.