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Old Sep 3rd 2018, 12:02 AM   #1
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Clutch Reservoir

I have a quick question? On the clutch reservoir (inside) u have a large rubber title like grommet then above that u have the plastic seal then lid. If I top off my clutch fluid to full then stick the rubber grommet back in it'll just spill over the top. Does that piece really need to be there? Can I just remove? Yes, I have air getting into the system somehow like most others. Let me know and thank u! Any help will be greatly appreciated

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Old Sep 3rd 2018, 01:05 AM   #2
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If you over fill the clutch/brake fluid Reservoir it will leak onto your dash.
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Old Sep 3rd 2018, 07:46 AM   #3
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The rubber seal is like an accordion so you need to fold it back to its compact size when you fill the reservoir. As far as the air, I just had to bleed mine and was wondering how it got air in the line. When I look at the reservoir the drain in the reservoir is in the center of the bottom of the reservoir. The bracket holds the reservoir angled forward so there is a bubble in the reservoir which during riding can be over the drain hole allowing air to enter the system if the clutch is actuated. I think the fix is to bend the bracket and or change to a larger reservoir.
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Old Sep 4th 2018, 01:59 PM   #4
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I've thought about this the other day too. The position of the reservoirs (both brake and clutch) are angled forward and thought this might cause for air to go in the line... But I dismissed this concern thinking that the reservoirs will always be angled at one time or another during extreme lean angles and rough shakes etc?

What are you thoughts on this guys?
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Old Sep 4th 2018, 02:17 PM   #5
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It’s a question of volume. The brake reservoir has a sufficient volume that the hole shouldn’t be exposed. The clutch though has very little volume, so if it is low there is potential for air to be drawn in. Certainly is cheap enough to get a larger reservoir.
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Old Sep 4th 2018, 04:11 PM   #6
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yeah ducati didn't think this through over the last 10+ years they have been working with reservoirs.
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Old Sep 4th 2018, 04:51 PM   #7
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Originally Posted by kensteele View Post
yeah ducati didn't think this through over the last 10+ years they have been working with reservoirs.
Maybe, probable the same way they didn’t think it through with the hydraulic fluid they’ve been using forever or the slave cylinders they’ve been using as long as the reservoirs
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Old Sep 4th 2018, 07:27 PM   #8
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I just don't see how the reservoir can cause air into the system? I think the slave is more likely the fault. The seal on the lid is pretty tight and with the rubber grommet in there it takes up all the play.
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Old Sep 4th 2018, 08:09 PM   #9
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Originally Posted by Domino View Post
Maybe, probable the same way they didn’t think it through with the hydraulic fluid they’ve been using forever or the slave cylinders they’ve been using as long as the reservoirs
but we know changing hydraulic fluid and changing slave cylinder seems to work in some instances. is there ever a case changing to a larger reservoir has solved the problem?
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Old Sep 4th 2018, 08:47 PM   #10
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Originally Posted by kensteele View Post
but we know changing hydraulic fluid and changing slave cylinder seems to work in some instances.
Nearly all instances, nothing to do with reservoir.
If that doesn't work then there has been a handful of master cylinders going faulty.

Last edited by Halo2; Sep 5th 2018 at 02:41 AM.
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