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G`day mate
check the hydraulics first. with the engine off bleed the booster by pumping the pedal a few times until the pedal is firm to push to the floor, if it has a small amount of free travel then is firm to push to the floor then the hydraulics are more than likely ok and your problem is the clutch it`s self.
If it`s the clutch it could be a number of things.
1 a cracked fork
2 a cracked diaphragm spring
3 a broken pressure plate hold back clip there are 3 or 4 of these can`t remember off hand
4 a broken fulcrum ring
all of these require box removal
hope this is of some help