1989 Volvo 240 DL Passanger brake light does not work even after bulb replacement what could be wrong?

If the passenger brake light on your 1989 Volvo 240 DL isn't working after replacing the bulb, the issue could be due to a faulty socket or wiring. Check for corrosion or damage in the socket, as well as any broken or frayed wires leading to it. Additionally, ensure that the brake light switch, located near the brake pedal, is functioning properly, as a malfunction there can also prevent the light from working. Finally, inspect the fuse related to the brake lights; a blown fuse could also be the culprit.