There is a wide variety of cooking oils from plant sources such as olive oil, palm oil, soybean oil, canola oil (rapeseed oil), corn oil, peanut oil and other vegetable oils, as well as animal-based oils like butter and lard.
We called a couple of the brake fluid companies and the answer was two to five years is a safe number for an unopened container. Wilwoodâs tech line claims that if the container is sealed, they feel it has an unlimited shelf life, but I would consider five years to be the limit.
Open a bleeders, let the fluid drain, close the bleeders. If fluid does not start to flow right away, give the master cylinder a few pumps and you should be off an running. When all of the bleeders are closed, top off the master cylinder. Re-connect the power brake booster hose and your system is bled. You should see fluid start to run out in about 10-15 minutes.