Brakes operate at very high temperatures, and this causes the fluid to deteriorate. High operating temperature is just one thing that can cause brake fluid to deteriorate.
Dirt and contamination are other problems. Although brakes are a sealed system, contamination forms as parts in the system wear and this builds up in the system. Rust is another contaminant. Moisture can condense in the brake system and that moisture can cause rust.
In the Sioux Falls, Harrisburg, Chamberlain, Pierre, and Tea, SD area, Vern Eide Acura is a well-known dealership with an excellent service department, comfortable amenities including TV, refreshments and snacks, WIFI and a relaxing atmosphere. They will answer any questions you may have on your Acura or will happily answer general questions on any other make you may own.