A slow, slight drop in brake fluid level over a long period can be normal as brake pads wear, because the caliper pistons move out and more fluid stays in the brake 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.
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.