brake lights 95 achieva

having trouble with my brake lights all the turn signals work and parking lights work and even the third brake light works but the regular brake lights don't ....i tried a new stop light switch still the same and i checked all the fuses it's a 95 2 door thanks

bulbs?

nope checked them ...... any idea what the black box mounted in the trunk next to the wiring harness is theres wires going into it..also do you know which wire is the brake lights brown or yellow on drivers side

it's fixed turned out to be the multyfunction switch never thought the brake lights would run through the turn signal switch ...oh well all is good again