Ha, reminds me of today, very un-mechanical coworker came in the office and said, "damn I think my brakes are done, will need to buy a new car sooner than I thought, the light came on and it barely stopped in the lot." I said "bud, lets go out at lunch and check you master cylinder" He asked "What's that?" so out we go at 12 and I pop the hood on his very old and well loved Mazda 3 GT 6 speed and low and behold his master is bone dry. I drive him the 3 min away to the auto parts store and we get a big ol bottle of Dot3 and fill it, pump brakes, fill it and a few fills later brakes are solid again. I told him he likely has a slow leak and to check the fluid but he's still buying a new car, the 3 won't pass safety next month LOL. He said in all the years I've owned a car I've never put brake fluid in one or even knew it was a thing. he said he thought the light was to tell him the pads were done.