Driving back from an upholstery shop a front brake line blew at the same time the master cylinder went Tango-Uniform. Narrowly avoided a crash. Just the rear brakes were working a little for a while before the pedal went to the metal, and the left rear cylinder was leaking as well. Glad to have AAA towing. It's been sitting at the mechanics for a week now waiting on delivery of a new master cylinder. Having them completely drain and flush the system and convert to DOT4 so we can get away from the corrosion problem from it sitting for periods of time. I've had to do the rear brake cylinders quite a few times in the past from them corroding up.