I have a 1989 Toyota pickup and all of the tail lights, turn lights, running, hazard and reverse lights work but not the brake lights. I replaced the whole tail lights and still no brake lights
you should check the pedal switch under the dash , see if there's power there and if the switch works , then check the bulb sockets contacts with a test light to see if theres power there when braking , the brake light may run through the directional switch and some bulbs have two filiments .Not sure exactly what you have but let us know what happens .
I'm going to call out insufficient chassis ground ...off the battery comes two wires...one to the engine/block and the other to the chassis/fender, look for corrosion on this grounding wire~...ps get a fresh battery and possibly fresh cables...after all 1989 is a lot of service all those years~
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