Here's how to properly test all under-dash and under-hood fuses with a test light or multimeter:
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You may want to spray the brake light switch, which is located just above the brake pedal, with WD-40. If this doesn't solve the problem, remove the switch and clean connections with abrasive cloth. Test switch continuity with a multimeter. As a last resort, replace switch.
If the problem persists, have someone depress the brake pedal, while using a test light or multimeter to probe for power in the brake light sockets. Ensure sockets are free from corrosion. Once you get power to the brake light sockets, apply a thin coating of dielectric grease to the base of each bulb.