Common causes of brake fluid loss on German autos include rusted steel brake lines, cracked rubber brake hoses, leaking caliper or wheel cylinder seals, and a failing master cylinder. Corrosion from old, moisture‑contaminated fluid and physical damage (impact, road debris) accelerates many of these failures.
Do not confuse a slow brake fluid level decrease in the reservoir due to brake pad wear with a brake fluid leak. When brake pads wear, the caliper pistons gradually move outward to compensate for the worn pads, and more fluid remains in the calipers rather than in the reservoir.
Large or rapid decreases in brake fluid level are not normal and usually indicate leaks or other brake faults that require immediate attention.
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If you have brake problems in Ann Arbor or nearby, call Stadium Auto Service at (734) 369-6787 to request an appointment. Stadium Auto Service in Ann Arbor is a brake repair specialist that works exclusively on Audi, BMW, Mercedes-Benz, MINI, Porsche, and Volkswagen.