How often should the brake fluid be replaced in a BMW 3 Series?

1 Answers
ColeFitz
07/29/25 6:41pm
BMW 3 Series brake fluid should be replaced every 40,000 kilometers. Below is more information about brake fluid:1. Brake fluid is an indispensable part of the braking system, serving as a force transmission medium. Since liquid cannot be compressed, the pressure output from the master cylinder is directly transmitted to the wheel cylinders through the brake fluid.2. Brake fluid is composed of ethylene glycol and various anti-corrosion additives. Over time, ethylene glycol absorbs moisture from the air, which lowers its originally high boiling point. When the boiling point drops to just slightly above that of water, the brake fluid is severely degraded, making the braking system prone to failure under specific driving conditions.3. The correct method to determine whether brake fluid can continue to be used is to perform qualitative or quantitative analysis by testing the moisture content and boiling point of the brake fluid.
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