I have a 05 Pontiac GTO 6spd. The clutch felt weak so i checked the clutch fluid and it was empty. I topped it off. The next day i had no clutch and no fluid. Found brake fluid below bell housing. So i changed the slave cylinder. Got everything back in and topped off master cylinder with fluid and pumped the clutch and bleed the line. Still no clutch, straight to the floor. Any ideas of maybe what i did wrong or if its the master cylinder that needs to be changed also.