materia clutch

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my materias clutch pedal has become very heavy.
its never been very light compared to my other car(nissan cube)
but just recently its like a brake pedal, cars only done 46000.00 miles
are all materias clutch pedals heavy Unknw
only driven mine so can not make comparisons, no judder or slip either.
could this be master or slave cyl seals Unknw
i welcome any thoughts or sugestions.
thanks .
chris.