Originally Posted by BAK04GT
that reminds me....in the k1200gt owners manual it says that as clutch wears that the fluid level rises...maybe a miss print?....but also i think it says the same thing for the brake juice.......anyone know whats up with that?....
That is correct.
If you look at the details of how a clutch and it associated linkage works, it becomes clear.
When the clutch plate wears in a car, the pedal will engage at a higher and higher point. Similarly in a bike, it will engage with less and less pull on the lever. This makes perfect sense, since when you pull in the clutch lever, the pressure plate moves AWAY from the disk (otherwise, how would the clutch release??).
So when the disk wears thinner, the pressure plate will naturally have to move "closer" to apply pressure disk, since it is not as thick as it once was. So if pulling the lever closer to the bars causes the pressure plate to move away from the disk, then obviously, a thinner disk will result in the point where the clutch starts to release, to occur with the lever further "out".
Now, if you have a cable actuated clutch, you will find that as the disk wears, the cable slack DECREASES for reasons given above. You have to adjust the clutch to add more slack.
In the case of a hydraulically actuated clutch, the result is that the slave cylinder's piston is pushed further back into the slave cylinder as the disk wears. In other words, the little piston doesn't have to travel as far to release a worn disk. The result is that fluid is pushed back into the master cylinder reservoir.... just as the manual said.
If this is confusing (and it probably is), I can draw a simple diagram.