How many watts does a car brake light have?

1 Answers
VonHazel
07/29/25 11:36pm
Car brake lights come in wattages such as P21W, W21W, W5W, and W16W. The brake light serves as a signal transmission switch. When the brake pedal is pressed, the brake light switch activates and simultaneously sends a level signal feedback to the ECU. The ECU, based on the signal frequency, sends a signal to the ABS or BD system, which then determines whether to illuminate the light. The brake light switch emits a level signal through its own on-off operation to prompt related systems to act or control the power supply of the brake light. During operation, by turning on or off—that is, the moment the brake pedal is pressed or released—it controls the illumination and extinguishing of the brake light. When illuminated, it alerts the following vehicle that the leading vehicle has entered a braking state, prompting them to slow down or maintain a safe distance.
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