corner lights on when braking?

ok so i have a 90 integra and my issue is that my corner lights come on when im braking and also my clock dims and my gauges dim when im braking to. does anybody know what is up with that?

My guess is a brake light fillement is touching a park light fillement in one, [or more] of the dual fillement, [brake/taillight] bulbs/ unplug the tail lights and step on brake, side markers should not turn on. then plug them in one at a time so you can see what side is the problem. 94