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To compensate for the wear on the brakes. As the brake pads wear down, they move closer to the rotors, and this brings the brake fluid level down slightly. Note: it is not a good idea to continually refill the brake fluid reservoir because a mechanic needs to check the level for an estimate of how much the brakes have worn. If the reservoir is full all the time it would appear that the brakes are not wearing down (which we know isn't true).

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17y ago

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