Member Contributer MadFrog Posted June 4, 2017 Member Contributer Share Posted June 4, 2017 I recently rebuilt the clutch master cylinder and refilled and bled it. Ok the test ride I noticed that even with the lever pulled on all the way, the clutch still grabs a little bit. It's hard to get into neutral and you can feel the bike trying to move forward ever so slightly. I figure I may still have a little bit of air in the line or the master cylinder? Any tip for getting the rest of the air out? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
gonerydin Posted June 4, 2017 Share Posted June 4, 2017 Try bleeding the banjo bolt at the MCSent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Member Contributer Lannyl81 Posted June 6, 2017 Member Contributer Share Posted June 6, 2017 I had to lean the bike over on the left in order to get all the trapped air out of the master. Link to comment Share on other sites More sharing options...
squirrelman Posted June 8, 2017 Share Posted June 8, 2017 air can hide behind the slave piston, so use a C-clamp to push it all the way in with bled screw open. Link to comment Share on other sites More sharing options...
Member Contributer expvet Posted June 9, 2017 Member Contributer Share Posted June 9, 2017 I rebuilt both the clutch slave and master recently and had the same problem building pressure when bleeding. After much pumping at the master I found that by using a large syringe I was able to force fluid from the slave bleeder up into the master. I lot of air bubbles began to rise out of the master's fluid so obviously there was still air trapped in the line. Once that stopped I pumped at the master and quickly pressure built up and I then bled as usual and wrapped up the job. Forcing the fluid up did the trick. Link to comment Share on other sites More sharing options...
Member Contributer VFROZ Posted June 9, 2017 Member Contributer Share Posted June 9, 2017 Air gets trapped at the master banjo, specially if the banjo bolt orifice is facing down. I found the easiest way to get rid of it was removing the master with lid on from the handlebars and placing it with banjo pointing down while I shake/tap the lever. Worked every time, brake master as well. Link to comment Share on other sites More sharing options...
Member Contributer Terry Posted June 9, 2017 Member Contributer Share Posted June 9, 2017 I removed the rear caliper on my VFR1100ST just last night, first using vacuum bleeder to remove all the fluid so I made less mess when I broke the line. I can vouch for an airlock in the master as being a real problem when you refill the system, and even with about 6" of fall from the reservoir to the master, I still had air in there until I put my vacuum bleeder back on and sucked fluid through to the caliper. Link to comment Share on other sites More sharing options...
Member Contributer Lorne Posted June 9, 2017 Member Contributer Share Posted June 9, 2017 Ok, nobody else queried the obvious so I will: did you replace the sealing washers on the banjo bolts? If not do so and retry bleeding. Link to comment Share on other sites More sharing options...
Member Contributer MadFrog Posted July 27, 2017 Author Member Contributer Share Posted July 27, 2017 I'll have to try to remove the whole assembly and tap it with the banjo pointing down because I think I still have a small air bubble somewhere. I did not remove the banjo bolt when rebuilding - I did it on the bike and just drained the fluid and replaced the plunger, spring, seals, etc from the lever side. I don't have new crush washers for the banjo which is exactly why I didn't want to remove it. :) Thanks a lot for all the help! Link to comment Share on other sites More sharing options...
Member Contributer mello dude Posted July 27, 2017 Member Contributer Share Posted July 27, 2017 Add a speedbleeder to the slave cylinder - it will make it waaaay easier. I dont even bother anymore to try to bleed a clutch without one. (Screw that!) Link to comment Share on other sites More sharing options...
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