Early in this link you asked about areas to check ......and I don’t remember seeing any mention of checking your brake fluid moisture. Seeing you don’t have many records of past service this would be good to know.

........brake fluid systems are very complex, especially when equipped with traction control and anti-lock brakes and it’s very important that the fluid be clean and free of moisture and other contamination. Brake fluid is hygroscopic which means it attracts moisture, and when the moisture in the brake fluid boils because of the tremendous amount of heat generated by the brakes, you can actually lose the ability to stop,.......and, moisture can cause corrosion of the wheel cylinders or brake calipers and eventually cause a leak.”

........your garage can give you this quick test or buy a tester yourself. If It fails the test, get an estimate for the fluid change and decide on whether to do it yourself.