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New and used car brake fluid is essential to proper braking and should be flushed at least once every two years (make this a step in your usual car maintenance). If your brake pedal feels noticeably more soft then usual, or if it sinks to the floor when pressed, that indicates your car has a brake fluid leak or a defective master cylinder. This needs to be checked immediately.
*These symptoms can also be caused by air bubbles in the brake lines or overheated, foaming brake fluid. If you can't remember when you last had your car's brake fluid changed, have it done soon.