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Hydraulic clutch issue

posted by mrl on Tue Mar 10 10:29 CST 2009
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last visit: Wed Mar 11 18:45 CST 2009

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Does anyone know if the stock Girling clutch master cylinder from a 1990 740 turbo SE is adequate (big enough) to activate a Corvette (1985) clutch slave cylinder? The fork is moving some, but the clutch does not seem to fully disengage. Do I still have air in the line? Do I need a larger master cylinder? Any advise would be greatly appreciated.

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Hydraulic clutch issue

posted by Rhys on Thu Mar 12 19:13 CST 2009
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last visit: Sun Nov 1 01:44 CST 2009

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It would be best to find the bore of the original GM master and slave cylinder, and then compare to the bore of the Volvo master. It's just hydraulics, and you'll have to move a certain volume of fluid to achieve clutch release. Then determine if the pedal effort is too high, and change lever geometry possibly.
The smaller the bore of the master the easier the pedal effort, but the shorter the travel of the slave cylinder, and vice versa.

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