Join Date: Sep 2008
Location: Fruitland Park,Florida
The most common cause for the stiff pedal is the line between master & clutch cylinder being collapsed or blockage in line.
Unless you know age of master cylinder, line, & slave, I would replace all of them.
But just to be sure pedal assembly isn't frozen, when you remove hydraulic assembly, make sure clutch pedal moves freely.
And welcome to the forum.