Question about 2002 Ducati ST4S

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My clutch fluid dried out over the winter. Air in the clutch system. What to do?

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  • rubenrod Apr 10, 2011

    When you say, 'force the piston...' in item number 3, what am I looking for? What does it look like? Can you be a little more specific?



    A little more specificity with item 5 as well.



    Thank you.

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  • Master
  • 2,187 Answers

You would need to bleed the system to get the air out. I found the steps below helpful.


1. Remove the hydraulic line/banjo bolt from the slave cylinder.

2. Fill the slave cylinder with brake fluid through the hole where the banjo bolt threads in and reattach the hydraulic line/banjo bolt, and torque.

3. Remove the clutch slave cylinder from the bike and manually force the piston into the slave cylinder. At this point, I usually use a small C-clamp (~$4 from Home Depot) and a socket in the cylinder to hold the piston firmly into the cylinder.

4. Fill the clutch master cylinder reservoir with brake fluid and pump the MC until you see fluid going into the lines. You may have to squeeze the line to the reservoir and/or crack the banjo open a bit to get the intial air out of the MC (just catch the fluid in a rag or paper towel).

5. Now bleed the system as normal, but with the slave cylinder in the clamp.

The difference here is a) you've already gotten the air out of the slave cylinder, and b) you aren't pushing against the clutch springs while you're bleeding, so when the system is free of air, the lever will be rock hard. Once the lever feels solid, you can remount the slave cylinder to the bike. It'll take a couple of pumps of the lever for the slave piston to re-engage the clutch actuator rod, so just make sure that your reservoir doesn't get so low while you do that, that you reintroduce air into the system.

Posted on Apr 08, 2011

  • Nicolo Carlo Parazo Apr 10, 2011



    For number 3 see below.

    http://www.giovannimoto.com/index.php?p=...

    For number 5 see below.. there are a few items which may help with the other steps.

    http://www.ducatisuite.com/clutch.html

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