Question on Clutch Master and Slave Cylinder Replacement

If the clutch pedal becomes rough during driving with hot engine and in summer days and stay rough even depressing it with engine off but with no brake fluid loss it's a hydraulic problem slave-master cylinders, a clutch kit mechanical issue or simply the pedal bushing?

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[Nick at Pelican Parts]

I would assume it is a mechanical issue with the clutch itself.

- Nick