All 4 brakes locked up???

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Having had this issue for several months with no one able to offer solution, it turned out to be brake booster. Yes, the brakes would slowly start to lock up after about ten miles and lock up so badly it would not be able to be moved. Having no solution, and not willing to start replacing parts given no codes were coming up, and having checked everything I could, got ABS bleeding diagnostics, bled over and over again, still not fixed, disconnected ABS module to isolate, no difference, disconnected pressure sensor, no difference, pinched off vacuum to booster, no difference, checked calipers, replaced brakes, hoses, no difference, so for those rare situations of locking up brakes and soft and hard brake pedal where brakes would barely stop, to hard pedal where they would lock up on their own, change brake booster, not cheap, and why I looked for an answer for months before throwing more money into this 200K money pit. lol