Repeated air in clutch hydraulics


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tom84std
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Repeated air in clutch hydraulics

Postby tom84std » Fri Jan 02, 2015 8:22 am



My 84 Standard has the nasty habit of collecting air in the clutch hydraulic system. It seems to accumulate enough about every six months to become a problem. The clutch becomes too soft to fully release. I bleed it at the Banjo connected to the master cylinder. It works perfectly for about six months, then I have to do it again. Not really a very big problem, but I'm curious as to why. Fluid level is always more than adequate, never gets low. Never disturbed, but every six months or so it happens. A magic gremlin?



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WingAdmin
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Re: Repeated air in clutch hydraulics

Postby WingAdmin » Fri Jan 02, 2015 12:19 pm

There's one of two ways air can get in there: A leak, or moisture that is turning to steam under pressure. The steam problem typically occurs under pressures seen only in brake systems, so I expect you will find your issue is a leak somewhere, perhaps a deteriorated seal in either cylinder.

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tom84std
Posts: 493
Joined: Fri Jul 13, 2012 7:40 am
Location: Arlington, Texas
Motorcycle: '84 STD 1200
2002 VTX1800
2007 Shadow 750
69 BSA Bitsa
2004 Virago
VW Trike

Re: Repeated air in clutch hydraulics

Postby tom84std » Fri Jan 02, 2015 4:35 pm

Yes, I thought it could be moisture and whatever vapor might result. A leak way down in the piston, sucking air in somehow eventually gathering in the highest point. You'd think I'd notice loosing fluid but it always seems to be fine. Even being at the proper level and had never been run dry enough to suck air in from the reservoir end? Easily fixed with a single stroke bleeding it. One little burp and top it off with fresh fluid every six months. Always has been a mystery to me. Can you tell it's too cold to ride?

triwing
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Re: Repeated air in clutch hydraulics

Postby triwing » Fri Jan 02, 2015 9:53 pm

It has been my experience that the slave is seeping air into the system, rebuild both master & slave cylinders,& use mighty vac to bleed,& the problem will go away.




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