Originally Posted by Air&Road

Flushing brake fluid once every year or two will not only extend the hydraulic life of your brakes, but because it keeps caliper pistons operating smoothly it will allow the pistons to push back quicker decreasing pad drag, thus having a fractional improvement on friction component life.

One of the things I learned from MB way back in the seventies was to maintain clean brake fluid. Doing so will almost eliminate brake and clutch hydraulic problems because of internal corrosion prevention.

My late Father, God love him, thought that changing brake fluid was silly and wasteful, but I have seen the results of it and highly recommend it.