On my gf's 2002 Focus Ztw with rear disc brakes, the car lost brakes a month ago,. She now has two other vehicles so it has sat. It has 151k miles on it, all pads and rotors replaced three years ago, and rear calipers were bled two years ago after a wheel bearing went out. The reservior is full and no signs of leaking. Where do I start? Pedal is soft regardless if engine is running or not.