uscsouth

Hello to all as I am new to the board! I have a 2000 Outback Wagon. 100k miles (alot of trips to the mountains to fish!) The clutch was slipping when I accelerated into higher gears. Shift, floor the pedal and the engine would race. Went and got the clutch replaced. Post repairs I am having a new problem. The clutch pedal now sticks to the floor when in bumper-to-bumper Wash DC traffic and also becomes "spongy" with frequent use. The auto repair mechanic orginally thought might be air in the hydraulics. After taking the car back to him twice to bleed the hydraulics, still have the problem. Essentially... the more I use the clutch, the softer the pedal becomes. Mechanic said could be pressure problem with Master Cylinder. This was not a problem before... now it is. Any thoughts? Is the mechanic correct or did he not install correctly? I didn't have any issue with the clutch pedal and/or hydraulic pressure before the repairs. Am I looking at more $$$ with a Master Cylinder fix? Any comments would be great. Thanks for listening!