i have a 1984 300D, on the dash it has worning lights, right by the brake woring lights there is a light that comes on that is yellow next to the brake that is red. it is circel that is yellow, the brakes needs to be pumped in order to have a full pedel. does anyone know what its tring to tell me? it comes on and off. what do i look for. need a picture of the idoit lights and what are thery tring to say to me? thanks man from Ohioo

This should be in Diesel Discussion, but the yellow (or orange) light with the circle is the front brake pad warning light. That is telling you the pads need to be changed.
Inspect the rest of the system as well.

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83 SD

84 CD