Yes. While this problem is occuring, observe the operation of the slave cylinder while stepping on the clutch pedal. And observe how far the piston on the slave cylinder moves. Now drive the vehicle where this problem disappears. Now observe the slave cylinder again while stepping on the clutch pedal. If the piston in the slave cylinder moves farther when the engine is hot than when the engine is cold, it pretty much indicates there’s a problem within the master cylinder.
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