The parking brake light used to blink on my wagon every once in a while. It usually did it when the moisture in the air was fairly high, ie rainy or recently rainy. Never figured out what was making it do it, mostly cause I never spent the time looking for it.

The brake pad wear sensors simple complete the ground when the outer layer gets worn off on the sensor. This lights up the light. A worn wire will cause blinking only if the exposed wire contacts a grounded part.

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