Wondering if a yearly or bi yearly Brake fluid Resevoir drain and fill (syphon out and fill) would be an effective 'freshening' alternative to bleeding? 2013 Camry ,2013 Corolla Here's additional thoughts / questions : 1. Could it introduce dangerous air bubbles by sucking out just the Resevoir with a turkey baster and refill? 2. Does the fluid actually mix ever between the lines and the Resevoir such that new fluid would mix with and refresh the old? 3. Related to #2 - if no real mixing occurs, does this mean that we actually drive thousands of mile on the same fluid trapped just in those lines from the factory!? If so, why even have such sized reservoirs? I've never seen a car even with thin brakes draw in much additional fluid from the Resevoir.