Your not going to get much more information regarding high clutch pedal effort. Paul at Maximillian Importing and Douglas pretty much covered just about every aspect of high clutch effort. The OEM Sachs kits are a well and suitable replacement clutch that I would recommend. As Paul pointed out, with high pedal effort the lever can in fact wear out. High clutch effort can be associated with several different scenarios but can also be indicators of a clutch that should ultimately be replaced by the Sachs Maximillian is offering. Information pertaining to when the clutch i.e. last serviced and or miles on the clutch would be helpful in determining the cause. Typically on most cars (the preceding text isnt intended to be M5 specific) a hydraulic clutch activates the clutch throw-out fork. A hydraulic clutch moves a small cylinder called the master cylinder (when clutch is depressed). Pressure is created in the master cylinder transmitted to the slave cylinder. The slave cylinder is attached to the throw-out fork by a small adjustable rod, when pressure is exerted on the slave cylinder, it operates the fork. Both master and slave cylinders are attached with hydraulic tubing. High clutch effort can be associated with fork binding in housing, a faulty pressure plate and issues centered around the master cylinder. Along with the clutch I would recommend changing the pivot pin, pilot bearing, rear crank seal
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