The links above show - very graphically! - why we need to flush the brake fluid every 2 years (or better yet, every year). The fluid should be golden in color - not brown. I have a Speedi-Bleed kit which makes the flush procedure a snap. Even paying the dealer is only $50 - much cheaper than replacing or rebuilding calipers, master cylinders, or ABS pumps. (You *did* look at the link Cigar Havana posted, didn't you?)
On a side note, MB specs a DOT4 fluid. I did a ton of research on brake fluids and the short version is to use Valvoline SynPower fluid, it has very high boil points (above DOT 4 specs), is easily available at every McParts store nationwide, and only cost $5/quart. Yes, ATE SuperBlue (and Typ200 Gold) is better... but it's harder to locate and costs $10-$12/quart. I prefer the ATE but the Valvoline completely outperforms any other cheap fluid on the market. Just make sure you change it at least every 2 years!
