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It turns the rear brake lights on as a safety feature. The brake pedal is pushed in, causing the fluid to move forward in the brake cylinder,activating a brake light switch. Even if the vehicle is off, the lights will still come on.

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โˆ™ 2005-02-08 11:09:07
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Q: Why does the car's electrical turn on when the brake pedal is depressed and the car is not running?
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