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What is the working principle of the brake light switch?

1Answers

LaRyder

09/05/2025, 03:36:14 AM

The working principle of the brake light switch is that when the driver steps on the brake pedal, it presses down on the contact point of the brake light switch, thereby completing the brake light circuit and illuminating the brake light. When the brake pedal is released, the contact point of the brake light switch disconnects, turning off the brake light. The brake lights are usually installed at the rear of the vehicle, with the main brake light being red. The red color enhances the light's penetration, making it easier for following vehicles to discern the driving status. Since the brake light switch is a signal transmission switch, when the brake pedal is pressed, the brake light switch closes and simultaneously sends a level signal to the ECU. The ECU then processes this signal based on its frequency and sends a command to the ABS/EBD system, which determines whether to activate accordingly.

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