The brake fluid is hygroscopic, meaning it absorbs and retains moisture over time. The moisture can travel through the braking components (brake lines, brake calipers, etc.) and cause corrosive damage. You might have heard about situations where a brake caliper “drags”, a common cause for that to happen is when piston/s gets stuck inside a brake caliper due to corrosion, and the brake remains “applied” at one wheel. This can create a dangerous situation.   To avoid this scenario, it is recommended that you have your Mercedes brake fluid flushed every two years. This way the brake fluid stays clean and free of moisture. For your safety, it is highly recommended you follow this maintenance schedule, and ensure it is only performed per Mercedes recommended procedures.   We suggest Mercedes-Benz power steering fluid be flushed when it becomes contaminated. Contamination occurs when the wear of the power steering components end up in the power steering fluid as a suspended fine powder of metal and aluminum. This contamination creates an “abrasive” action between the moving parts of the power steering system.