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Clutch Goes Soft After 20 Miles or So

M

mikejudge62702

Member
Member
Hi all, 2009 Concours 14 ABS. My clutch starts out fine, then after about 20 miles or so starts getting soft and then nothing. I'm afraid to take it any distance until I figure out the issue. Fluid was changed recently, thinking there's air in the system? Any thoughts as to where to start looking? Thanks for your help.
 
i had the similar issue recently, even after replacing / bleeding the clutch lines I still had that issue. replaced the diaphragm in the reservoir and not had that issue since.
 
redline said:
i had the similar issue recently, even after replacing / bleeding the clutch lines I still had that issue. replaced the diaphragm in the reservoir and not had that issue since.
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I guess I don't understand the function of the diaphragm. What does replacing the diaphragm do that keeps it from going soft?
 
So I bled the clutch master with my Mityvac, and then the slave. Bam! Good clutch. Looks like it might have been air and old fluid. But I'm with Bud...what does the diaphragm actually do? Thanks!
 
Bud said:
I guess I don't understand the function of the diaphragm. What does replacing the diaphragm do that keeps it from going soft?
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i don't know for sure, followed the advice of a motorcycle mechanic who suggested to always replace it when replacing the fluids. looking at the diaphragm , I figured it helps to ensure a tight seal, so preventing air leaks. maybe someone else on the forum may know more but again, it wasn't until i replaced that little rubber piece in the reservoir that i stopped getting air into the lines. i think about 40.00 so not that cheap, there are 2 the same for front brake and clutch and a different (round) for the rear brake reservoir. but doing this every 2 years or so, not that big of a deal.
 
redline said:
i don't know for sure, followed the advice of a motorcycle mechanic who suggested to always replace it when replacing the fluids. looking at the diaphragm , I figured it helps to ensure a tight seal, so preventing air leaks. maybe someone else on the forum may know more but again, it wasn't until i replaced that little rubber piece in the reservoir that i stopped getting air into the lines. i think about 40.00 so not that cheap, there are 2 the same for front brake and clutch and a different (round) for the rear brake reservoir. but doing this every 2 years or so, not that big of a deal.
Click to expand...
My dealer has one for $18; I'll pick it up just to have on hand. Thanks for your input.
 
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