Brake Master Cylinder problems of the 2001 Saturn SL2

Driving down a two house dead end street traveling about 20 miles per hour, when the drivers side rear wheel cilinder broke and all ability to stop was lost. After replacing the wheel cilinder, it was also realized that the passenger side brake line to the rear brake was missing several washers and then caused the brake line to leak. Two weeks later the master cilinder for the brakes also failed all before I ever hadto replace any of the brake pads or shoes.