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It may be the slave cylinder as there are many threads about it in the forums here is one of many -

Clutch Pedal - depressing clutch pedal sometimes goes...

Have an intermittent issue when driving When depressing clutch pedal sometimes goes soft and I am unable to either get out of gear on in gear. Does the Corsa have a hydraulic clutch system Looking around on internet not giving me much help apart from clutch spring which I don't think it is

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