How often should the brake fluid be replaced for BMW 320li?

1 Answers
Noah
07/29/25 5:14pm
Under normal driving conditions, the brake fluid should be replaced every 30,000-50,000 kilometers or after continuous use for more than 2 years. Do not mix different types of brake fluid: Due to differences in formulations, mixing brake fluids can lead to a decrease in performance. Additionally, if the brake fluid absorbs moisture or contains impurities, it should be replaced or filtered promptly. Otherwise, it may result in insufficient braking pressure and affect braking performance. Methods to determine if brake fluid needs replacement: New brake fluid has a light yellow color, while aged brake fluid becomes noticeably darker and contains many impurities. The deterioration of brake fluid is a slow process. In practice, deteriorated brake fluid mainly affects the pedal feel of the braking system rather than completely eliminating braking force. When the brake pedal feels firm to soft—meaning the brakes respond immediately when the fluid is in good condition but become spongy as the fluid deteriorates—it is time to replace the brake fluid.
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