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.
Leaks can come from the overflow tank, the radiator, the water pump, coolant hoses and elsewhere. For your own safety, wait until your engine is cold before opening the radiator cap. Brake fluid can be light brown or even clear when new, but it typically darkens as it ages. Itâs also slippery, and vital to stopping your car. Thatâs a good reason to treat a brake fluid leak as an emergency.