Clutch fluid loss - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 21 (permalink) Old Jun 10th, 2019, 9:15 pm Thread Starter
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Clutch fluid loss

Hi guys - went to ride the 900 SS/SP on Sunday. Bike started right up after two weeks. However, the clutch lever was without any resistance (punishment or not riding it...). Checked the reservoir and it was empty. Was not expecting this since no indication from almost weekly rides it was losing fluid, and weirdly - I cant find a pool of liquid under the bike. I will be getting the replacement fluid etc (I have the Snyder Maintenance book - need it since first Ducati, period, and bike in a long time). Any ideas what might have failed and lead to the leak? I need to investigate further of course - but no fluid on floor has me flummoxed. Thanks in advance for any suggestions or leads to follow...

96 900SS
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post #2 of 21 (permalink) Old Jun 10th, 2019, 9:48 pm
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did you take off the belly pan to see if it leaked somewhere in there? (and hence didnt make it to the floor)

i'm thinking a pinched brake line, or a failed slave cylinder. i'd think you'd be able to visually inspect and see a leak from the slave.

also inspect where the lines bolt up to the master and the slave. perhaps a bolt got loose? i'm betting its that, and its the bolt on your master cylinder...


i mean, the fluid had to end up somewhere, rite?!! hahaha

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post #3 of 21 (permalink) Old Jun 10th, 2019, 9:58 pm Thread Starter
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Agree - the fluid can't have disappeared/evaporated. I was also thinking its within the fairings. On initial inspection nothing was soaked/wet from reservoir to where the line was too hard to track. More effort on my part - will follow the line.

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post #4 of 21 (permalink) Old Jun 10th, 2019, 10:53 pm
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As slippery as brake fluid is, had it leaked from a fitting or the hose failed between the reservoir and the slave, you would have seen some fluid. Fill the reservoir, bleed it a lot, then look for a possible leak. The clutch slave can be difficult at times to properly bleed since it’s lower than the master. You may want to try reverse bleeding it, from the slave to the fitting at the master.

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post #5 of 21 (permalink) Old Jun 10th, 2019, 11:23 pm
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Pop the clutch cover off to see if the fluid is in there soaking up the clutch pack rings - o-ring on the clutch rod could be shot.

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post #6 of 21 (permalink) Old Jun 11th, 2019, 5:51 am Thread Starter
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Thanks for the ideas. One thing I noticed - even when I was buying the bike (and at that time I saw it as a good thing as bike was in such great original condition w/ <6k miles)- is that the clutch and brake lines appear to be "original" to the bike. These are all rubber, that's certain. Back of my mind is I may need to replace these lines if I'm going to ride the bike - which is the reason I bought it.

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post #7 of 21 (permalink) Old Jun 11th, 2019, 6:10 am
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it'll have a leaking slave seal. either get a new seal and redo the slave - you'll need to give it a good linish by this time - or replace it with an aftermarket.
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post #8 of 21 (permalink) Old Jun 11th, 2019, 9:42 am
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Originally Posted by belter View Post
it'll have a leaking slave seal. either get a new seal and redo the slave - you'll need to give it a good linish by this time - or replace it with an aftermarket.
^^^This. If your slave cylinder is leaking, you may not see any fluid. Particularly if the rubber accordion like boot is in place and intact, fluid will build up in it, and work it's way out around the push rod or any kind of a hole. As the slave is just above and forward of the countershaft sprocket, fluid can leak out onto the chain. Once it starts doing that, you won't notice it because only a little leaks out at a time. The chain, then carries it away to get flung off onto the rear wheel and underside of the hugger and undertail.

The oring on the push rod doesn't have anything to do with clutch fluid retention. The push rod goes through the lay shaft and the orings simply seal that opening....sean
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post #9 of 21 (permalink) Old Jun 11th, 2019, 12:35 pm
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Quote:
Originally Posted by Luftgekult View Post
Thanks for the ideas. One thing I noticed - even when I was buying the bike (and at that time I saw it as a good thing as bike was in such great original condition w/ <6k miles)- is that the clutch and brake lines appear to be "original" to the bike. These are all rubber, that's certain. Back of my mind is I may need to replace these lines if I'm going to ride the bike - which is the reason I bought it.
I would suggest doing Dual braided brake lines/clutch line for sure. It made a huge difference in brake power and a smooth clutch. These are from Galfer…
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post #10 of 21 (permalink) Old Jun 11th, 2019, 10:57 pm
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Originally Posted by Iwannaduc View Post
^^^This. If your slave cylinder is leaking, you may not see any fluid. Particularly if the rubber accordion like boot is in place and intact, fluid will build up in it, and work it's way out around the push rod or any kind of a hole. As the slave is just above and forward of the countershaft sprocket, fluid can leak out onto the chain. Once it starts doing that, you won't notice it because only a little leaks out at a time. The chain, then carries it away to get flung off onto the rear wheel and underside of the hugger and undertail.

The oring on the push rod doesn't have anything to do with clutch fluid retention. The push rod goes through the lay shaft and the orings simply seal that opening....sean
Which is pretty much what happened with mine when the slave died. I replaced my OEM slave with an Oberon unit, which gives a lighter pull on the lever.
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