This one is tricky. I know that gmc had a problem with the hazard button dropping out the brake lights except for the third light. There was a recall so you may be in luck if it includes your vehicle, or it maybe switch that detects the brake being depressed. I had that problem w/1999 Jimmy and my cheap fix was to jump each side off the third brake light. I used the top bulb in assembly and disconnected the wire that feeds the brake light but left running light wire on. Havent had a problem since.
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