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Any clutch that is 'pushed in' is basically disengaged. When you push in the pedal, the two plates that compose the clutch assembly are separated from each other. If you have grinding when these parts are pressed together but hear nothing when they are apart, the problem should seem obvious. The plates are no longer working as they should and probably need replacement. One other possibility is that the clutch is operating normally and some other part of the drivetrain is damaged. The effect of this would be similar and would only be present when the clutch is engaged. In any case, an inspection is necessary to further diagnose the problem.

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Q: Why is my 79 Porsche's clutch grinding when released but pushed in it stops?
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