On my 940 I originally had the clutch master cyclinder push rod hole with a worn slot in it, making for crunchy gear changes. It only takes 1-2mm to lose most of your travel due to the long lever. The easy way to detect this is to lift the clutch with your toe, I had maybe 1" of travel upwards, after fixing this is down to a few mm.
The pedal and master cylinder are plastic with a metal pin (older cars like the 240 are metal). It doesn't seem to affect every car but some seem to get it, maybe if its not lubricated correctly. My car seemed to have it from near the start, as the records have evidence of clutch bleeding, but the dealer didn't get to the bottom of it. Its been fine for many years after replacing with a used master.
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