Clutch Pressure Gone! - MVAgusta.net
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post #1 of 33 (permalink) Old 06-04-2013, 06:52 AM Thread Starter
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Clutch Pressure Gone!

Long story short, I took the bike off the stands in April, she started right up, but when I went to put it into gear the lever came straight back with no pressure, and won't go into gear. I rolled it into the garage, attempted to bleed the clutch as I have done before with no luck. I have swapped out the reservoirs in case it was an issue with the black diaphragm thingy in the reservoir, with no luck, and after reading threads on here, I am at a dead end.
One thing I do notice, is that I am not getting any bubbles when I am pressing the lever with fluid in the reservoir, so it makes me wonder if the master cylinder has gone bad, or if something else is wrong here.

I would really like to ride my damn bike, as it has been since October, and could really use some help. Thanks in advance.

Chris

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post #2 of 33 (permalink) Old 06-04-2013, 07:37 AM
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when you bleed it, do you get any feel at all? you might have a big air pocket, and the clutch side isn't the easiest to bleed. Its a pretty simple system though, it could only be a couple of things. Either the seal in the master or slave is dead, or there is an airbubble trapped in there.
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post #3 of 33 (permalink) Old 06-04-2013, 10:53 AM Thread Starter
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I don't get any feel at all. I even have a lot of suction on the bleed valve when I am trying to bleed it, so I would think any air pocket would be sucked out. I feel like I am taking crazy pills here.

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post #4 of 33 (permalink) Old 06-04-2013, 12:41 PM
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are you using a mightyvac or something on the bleeder side? have you tried just bleeding slowly the traditional way?
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post #5 of 33 (permalink) Old 06-04-2013, 06:55 PM
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failed master cylinder?

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post #6 of 33 (permalink) Old 06-04-2013, 08:13 PM
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Originally Posted by zvez View Post
failed master cylinder?
Yep.


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post #7 of 33 (permalink) Old 06-04-2013, 10:20 PM
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Chris;
remove the slave.....is it leaking?

you get 2 choices;
the M/C seal or the slave seal

with the slave removed and it not leaking put a small C clamp on the slave piston.....pump the M/C
pressure? or no.....its the M/C

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post #8 of 33 (permalink) Old 06-04-2013, 11:16 PM
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When I replaced the slave on my Brutale it took what seemed like hours to get any pressure back in the lever. There was a particular point at pulling the lever towards the handlebars when bubbles would appear, moving the lever a couple of mm back and forward at that point eventually got there for me and then a normal bleed procedure sorted it all out from there.
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post #9 of 33 (permalink) Old 06-05-2013, 06:32 AM Thread Starter
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as for bleeding, I am using a large syringe to provide sucking pressure, getting small bubbles out of the bleed valve, but not a constant flow of fluid.

I will try a few of the things mentioned here before I go and buy a new M/C. If I go that route, I swear I had seen some decent options less than $200, but can't see to find them again.

I appreciate all your help gentlemen!

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post #10 of 33 (permalink) Old 06-05-2013, 07:33 AM
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sometimes the angle at which the master cylinder sits does not allow the air to get out of the system if you are just pumping the handle. Take your syringe and put it in the reservoir right on the hole where the fluid enters the master cylinder. Keeping a tight seal extract any air that might be caught int the master cylinder. I had the same problem until I did this.

That still doesn't explain why it failed just sitting in the garage
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