So Hello everyone. I have a 2017 Ford Flex that started acting wonky about 7 months ago or so. We would start it up one day and the “Check Brake System” light would come on. When it came on.. we would hear an electric humming noise and the car would do a hard skid every time we came to a stop, even when driving slowly. The next time we started the car and the light DIDN’T come on, the car drove perfectly fine. This went on for a little while and we asked a brother-in-law to see if he could find anything. He found a 3to4 inch vacuum hose under the hood (right on top) that was disconnected. He reconnected it and everything seemed to be great for a while. Now.. it’s doing it again but now ALL THE TIME even though that hose is still attached. The Check Brake System light never goes away now. I replaced all of the pads on all 4 wheels just to rule that out. They needed to be replaced anyway. But yeah.. still doing it. I took it to Autozone and the scanner did read a code C0021-92 which is for a brake booster. Is it possible that I just have a vacuum leak somewhere and that is what’s throwing the code?
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