Be thankful the brake problem did not do the opposite...your system is fine. A poor connection got corrected somehow in the process.
Once upon a time in downtown L.A. I had to park in a Wal-Mart parking lot and run in and use the restroom. The open bed of the pickup was FILLED with brand new car batteries which had cardboard cover boxes atop them. I hastily scribbled "BAD!" atop each box and several minutes later I returned and not one battery had been touched.
Just scribble BAD BATTERY RETURN FOR WARRANTY on a scrap of paper and lay it atop your battery. Then see what doesn't happen.