2006 Scion TC Clutch issues

If pedal pressure feels normal then it is as connman429 described. The clutch face is probably smooth as glass. Your fly wheel needs to be carefully examined for overheating and stress cracking. It is probably glassed over and possibily grooved at this point. Much like a brake rotor, it will most likely need to be turned. That is if you can even find someone that can turn a flywheel any more. Prepare for replacement with the clutch. Both are wear items, but the flywheel should last well beyond the life of 1 or 2 clutches. If the wear is not beyond limits, the grooves too deep, and no stress cracking; you can rough up the surface with an orbiting palm sander and about 120-grit sandpaper to remove the glossy surface. Just evenly sand in a circular motion around the circumference of the clutch mating surface of the flywheel. The trick here is not removing the ridges, so much as, producing a matte surface for grip. A glossy flywheel facing will cause the new clutch to not break-in properly and eventually gloss over leading to potential slipping at high torque loads (like starting on a steep hill).