I was having trouble adjusting the clutch on a 48 Commodore. I couldn't get it to adjust out far enough to allow for changing gears when the motor was running without grinding. The last attempt ended in the clutch going to the floorboard and staying there when I pushed the clutch pedal down. It's like the pressure plate has given up the ghost as there is no pressure on the cross pedal (with the rubber tips) that releases the throw out bearing. Any ideas as to the cause will be greatly appreciated.