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What does a Subaru Forester brake and battery warning lights on mean?
Wiki User
∙ 12y ago
Modern automobiles have brake pad thickness sensors. My 2004 Forester has one on the rear and one on the front. The sensors are mounted on one brake pad each. When the brake pad wears down to a predetermined thickness the brake rotor wears the coating off of the sensor and provides the contact surface so that the connection is made between the two wires ( on some cars) or just provides ground on others. Now the brake indicator light comes on. The thickness of the pad where this happens is set so that you have some time to react before the metal backing plate of the brake pad comes into contact with the brake rotor and destroys it.
The battery light means that a low voltage condition exists at the battery. Not in the battery, the light does not come on if your battery fails, it comes on because your altenator is not putting out enough voltage to power the vehicle. This could be altenator failure on the belt driving it has a problem. Loose or even broken. When the voltage falls below 7 volts your ignition system will fail and the engine will stop running not to mention that the electric starter won't function. Hope this helps.
Wiki User
∙ 12y ago
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