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What is the reason for one brake light bulb being on and the other not?

2 Answers

MacCali

07/28/25 11:14pm

The reason for one brake light bulb being on and the other not is: the filament of the brake light has melted. When used for a certain period, aging is quite normal, causing the brake light to fail to function properly, and it needs to be replaced promptly. A damaged brake light switch can affect the rear vehicle's accurate judgment of the braking action. A faulty brake light switch can result in the brake light staying on, not lighting up, or flickering intermittently. The method to replace the brake light switch: 1. Remove the protective panel above the brake and accelerator pedal to access the brake light switch; 2. Unplug the corresponding wiring harness and directly remove the brake light switch; 3. Install a new brake light switch and reassemble the components in the reverse order.

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HenryLee

08/12/25 3:37am

I encountered this situation when repairing my car that day. Actually, most of the time it boils down to three reasons: either the bulb is burnt out, the connector is loose, or there's an issue with the wiring. First, open the trunk and locate the bulb socket. Pinch the bulb base and twist it counterclockwise to check if the filament is broken. Replacing it with a new bulb only costs about ten yuan. If the bulb is fine, then it's likely that the socket is rusted or the wire has come loose, especially after rainy days. Last time with my own car, the plug got water inside causing poor contact, and spraying some rust remover fixed it. If one side of the LED brake light isn't working, then you'll need to check the circuit board, which requires a professional mechanic. Don't underestimate this issue—if the car behind can't see your brake light, it's easy to get rear-ended. Last time I delayed fixing it and ended up with a ticket.

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