If directional signals or brake lights stop working: 1) Check for burnt-out bulbs and replace them if necessary. 2) Inspect the fuse box for any blown fuses related to the signals or brake lights. 3) Examine the brake light switch, often located near the brake pedal, for malfunctions. 4) Check the turn signal switch or relay for issues. 5) Inspect the wiring for damage, corrosion, or disconnections. 6) If you're not comfortable with these steps, consult a mechanic.