What causes brake lights to stop working in my 1990 Chevy heavy duty truck?

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1983 Chevy Truck Wiring Diagram : Gm Full Size Trucks 1980 1987 Wiring

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1983 Chevy Truck Wiring Diagram : Gm Full Size Trucks 1980 1987 Wiring
1983 Chevy Truck Wiring Diagram : Gm Full Size Trucks 1980 1987 Wiring

What causes brake lights to stop working in my 1990 Chevy heavy duty truck?
What causes brake lights to stop working in my 1990 Chevy heavy duty truck?

1990 Chevy Truck Ignition Wiring Diagram | Wiring Diagrams Nea
1990 Chevy Truck Ignition Wiring Diagram | Wiring Diagrams Nea

1991 Chevy Truck Wiring Diagram - Wiring Diagram
1991 Chevy Truck Wiring Diagram - Wiring Diagram