| Perform a function test of the clutch master cylinder |
| Before you renew the clutch master cylinder or slave cylinder you must - in the case of the following faults - first carry out the appropriate checks. |
| Noises when operating the clutch: |
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| First check over-centre spring or clutch pedal switch for noises. |
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| If you hear a noise, remove over-centre spring and repeat check. |
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| Renew relevant component. |
| After releasing clutch pedal it still remains depressed / does not return to its initial position. |
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| Check whether the clutch pedal returns all the way to its initial position, thereby uncovering the vent opening in the master cylinder. |
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| The vent opening must be uncovered, otherwise the permanent self-bleeding function for the hydraulic clutch system will no longer be effective. |
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| The self-bleeding function of the clutch system can be impaired if the footwell trim or floor mats get trapped, if the clutch pedal switch jams or if the driver keeps his foot on the clutch pedal for long periods of time. |
| Check the complete hydraulic system for external or internal leaks. |
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| Check brake fluid level in brake fluid reservoir. |
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| Check clutch master cylinder and slave cylinder as well as the pipe/hose assembly including connections for external leaks (visual inspection). |
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| If you identify any leaks you must renew the leaking component. |
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| Clutch disk worn (except SAC clutch) |
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| Mechanical defect on the pressure plate → Chapter |
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| - Clutch lining when new: approx. 115 N |
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| - Clutch lining at wear limit: approx. 160 N |
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| - approx. 140 N for complete service life of clutch |
| Clutch does not disengage or does not disengage fully: |
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| Air in hydraulic system: bleed clutch system → Chapter and check hydraulic system for external and internal leaks. |
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| Clutch plate does not run smoothly on input shaft splines |
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| Needle bearing in flywheel (centring bearing for input shaft) defective, renew needle bearing → Rep. gr.13. |
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| Foreign body in clutch system |
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| Mechanical defect on the pressure plate → Chapter |
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| Wrong components used or components forgotten when carrying out repair work (e.g. intermediate plate). |
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