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There has been a service bulletin for that type of concern. Here is what it states.
Clutch Pedal Does Not Fully Reach its Original Position
This is caused by air in the hydraulic system. In the event of a complaint, bleed the hydraulic system according to the revised instructions in the Workshop Manual, --> see Enclosure and Preliminary information --> Workshop Manual '300107 Bleeding the clutch system'.
If, contrary to expectations, the problem occurs again after you have carried out the required remedial action, the following procedure applies:
--> Workshop Manual (986) '302331 Converting clutch line on master cylinder' --> (Step 8).
Bleeding the clutch system
Use only new Super DOT 4 class brake fluid. This brake fluid is available under the following part numbers: