my check engine light ,( brett) on 1990 Volvo 740

both brake indicator lights ,and the light bulb light are on ,what does that mean

Asked by for the 1990 Volvo 740
The brake indicator lights can be from low brake fluid, e-brake switch adjustment or a failure of the brake hydraulic system. The bulb light is indicating a problem with one of the exterior lights.
Did all these lights and the O/D light come on at the same time?