Read the passage and it says very clearly that CHANGING THE PADS makes the pistons retract because you must retract the pistons to change pads! Mike Not saying this is the cause, but if the pads/piston retracted from the rotor, the pedal would go to the floor since the first brake application would be needed to take up this space. Can't see how green fade would cause the pads and pistons to retract though. Dave