Brake Drum Wheel Cylinder problems of the 2014 Kia Motor Forte

The problems with the brakes happen when the car is in motion and on both sides of the vehicle. The rear caliper guide pins were frozen by corrosion, preventing the cylinder to extend and engage the brake pads on the rotor. This resulted in the lose of any rear braking action. When the anti-lock braking would engage due to lost road contact, (ie. Icy or bumpy/rough roads) there was no braking action at all. During normal driving, the rear brakes being frozen, the car relies solely on the front calipers to stop the car. No accidents happened during this time. I decided to replace the rear pads and noticed when I removed the wheel I found the rear rotor was rusted and pitted due to no contact with the pads. When I removed the caliper assembly the pins were frozen in place and could not be be freed. This required that the whole assembly needed to be replaced. The car was four years old with about 85,000 miles when I replaced the rotors, pads and caliper assemblies. The condition was probably happening for about 9 months before I decided to replace the pads.