Many non-Japanese conflate sashimi and sushi; the two dishes are actually distinct and separate. Sushi refers to any dish made with vinegared rice, and while raw fish is one traditional sushi ingredient, many sushi dishes contain seafood that has been cooked, while others have no seafood at all.
It's the moisture and contaminents that break down the DOT 3 and 4 fluids which is the reason to change the fluid in the first place. If you don't change it, what happens is moisture enters the system via the vented fill caps on the brake master cylinder. This moisture along with dust, mixes and travels in the system eventually making it's way to the lowest points in the system.
When you step on the brake pedal, hydraulic fluid rushes to each brake to apply the pressure that slows your vehicle. Over time the fluid can become compromised by moisture and other contaminants and brake performance can suffer. Your Jiffy LubeÂ® Technician will inspect your car and tell you whether a brake fluid exchange is called for.