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Old May 25th, 2013, 04:53 PM   #1
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Clutch Master Cylinder

Is there any way to test the integrity of the Clutch Master Cylinder on an 1198SP?
Spent all day bleeding the system to contstantly get air and no pressure in the lever.

Setup is a stock master with a DP slave. DP slave was replaced under warranty last year as it was letting air into the system.
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Old May 25th, 2013, 05:21 PM   #2
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did you bleed the nipple near the lever as well
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Old May 25th, 2013, 05:23 PM   #3
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Lever and slave. Over a dozen reservoirs full.
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Old May 25th, 2013, 11:19 PM   #4
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Just a thought but Don't open the bleed nipples to far otherwise they will draw in air when you release the lever.
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Old May 28th, 2013, 06:51 PM   #5
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Currently have the same issue on the same bike with the same parts. Ran about 5 reservoirs of clean fluid through the lines and bleed both ends starting at the slave then the master. Everything was fine for about 100 miles. Then I started having the same issue with the clutch dragging and impossible neutral. Went back at it with the mighty vac and all is ok again. Lets see what happens now. I think it's the DP slave but not sure how to prove that without purchasing a replacement... Looking at the yoyodyne if problem comes back or maybe Ducati will replace this one. I also didn't notice any leaks when I inspected the slave.
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Old May 28th, 2013, 07:04 PM   #6
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I almost guarantee you its the slave like what was said above.

Yoyodyne is what i went with (after trying both a DP and EVR slave) and all has been well since. I have to add that i also replaced the bearing on the clutch pressure plate holding the push rod. I think my problems started with a stuck bearing causing the rod to spin in the slave, resulting in heat building up and destroying the fluid.

Good luck.
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Old May 28th, 2013, 07:08 PM   #7
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I put the OEM slave back on the bike, no more issues, got to ride Monday without clutch going spongy. @RUNAWAY if you have the OEM put it back on the bike.
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Old May 28th, 2013, 07:32 PM   #8
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Bought the bike with the DP slave on it. Wish I had the stock one so I can make sure its the slave and not the master.
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Old May 28th, 2013, 09:45 PM   #9
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I replaced the stock slave cylinder with an EVR and was hoping it'll solve the problem of air in the system . . . it didn't . . .
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Old May 31st, 2013, 06:12 AM   #10
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check the master itself mine had a tear in the rubber boot and fluid was leaking from it very slowly causing me to lose feel at the mid- end of a track day. I replaced with a RCS master and all is fine so far....
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Old May 31st, 2013, 02:54 PM   #11
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I did notice a little tear in the rubber boot but I dont see any fluid leaking from it. Can this really be the cause of air getting into the system?
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