clutch slave cylinder keeps building up pressure


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dlddpt
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clutch slave cylinder keeps building up pressure

Postby dlddpt » Tue Mar 10, 2015 1:55 pm



OK... back ground... had clutch go out 2 years ago by slipping so replaced and no problem that season.. last year rebuild master cylinder then notice clutch slippage and lever getting hard.. cracked the bleeder and fluid SHOT out.. worked again on MC... even took a torch file to clean out vent hole... still the same.. rebuilt slave cylinder including emery cloth to cylinder... still the same.. got different clutch line... granted used one.. couldnt find new one..... still the same
can only ride short 10-15 mile rides then have to stop and crack bleeder
thinking about going with new slave cylinder since only thing have not changed

OK,,, ANYONE GOT ANY IDEAS..



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virgilmobile
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Re: clutch slave cylinder keeps building up pressure

Postby virgilmobile » Tue Mar 10, 2015 2:11 pm

There is a verrrrryyy tiny bleeder hole just in front of the main feed hole on the master cylinder.Its plugged.
Same thing happens on the brake master cylinders too.
These 2 holes(ports) feed fluid into the master cylinder.The tiny one is the pressure relief port.

dlddpt
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Re: clutch slave cylinder keeps building up pressure

Postby dlddpt » Tue Mar 10, 2015 2:42 pm

that is the one that cleaned out with touch tip file

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Re: clutch slave cylinder keeps building up pressure

Postby WingAdmin » Tue Mar 10, 2015 3:37 pm

dlddpt wrote:that is the one that cleaned out with touch tip file


Are you sure? How thick is the file? Normally you need to use something extremely small - like a guitar string - to clean out that tiny hole.

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Re: clutch slave cylinder keeps building up pressure

Postby dlddpt » Tue Mar 10, 2015 3:57 pm

that is what is the file is.. used to clean the "red wrench" burner tip

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Re: clutch slave cylinder keeps building up pressure

Postby virgilmobile » Tue Mar 10, 2015 4:21 pm

The idea is when the lever is released,the seal on the master cylinder piston just passes the bleeder allowing any pressure in the line to be pushed back into the resavoyer.
Now if the piston does not completly get pushed back due to a weak spring,obstruction,jammed piston or any other reason,the seal may not clear the tiny hole.

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Re: clutch slave cylinder keeps building up pressure

Postby dlddpt » Tue Mar 10, 2015 5:59 pm

MC rebuilt.. moves fine passed the release hole... even reamed release hole out about .01..pressure is building up in slave.. piston moves freely... tested this by pulling off slave still connected to line... used old valve spring and c-clamp.. then cycled MC.. no problem.. what makes piston return in clutch area?.. could there be weakness in that?

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Re: clutch slave cylinder keeps building up pressure

Postby virgilmobile » Tue Mar 10, 2015 6:25 pm

Pressure is building in the slave due to heat.This is normal.there is no one way valve between the slave and the master.when the master is fully retracted,there is a open connection between the supply and the slave.
If your willing to verify,take a wrench and a couple of rags with you next trip.When it acts up,instead of opening the bleeder(at the slave),crack loose the banjo fitting right at the master.
This should also release the pressure just like the bleeder.If it does...there's something not right about the master.
The fact that the clutch lever does operate the clutch means that fluid is being forced into the slave and back out,so the slave and hoses must be working.

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virgilmobile
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Re: clutch slave cylinder keeps building up pressure

Postby virgilmobile » Tue Mar 10, 2015 6:43 pm

Just like your brakes too...if you put pressure on the caliper piston,trying to force it back in,excess brake fluid can be seen going back into the reservoir.

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Re: clutch slave cylinder keeps building up pressure

Postby dlddpt » Tue Mar 10, 2015 7:02 pm

ok.. that sounds like good idea that I have not thought of.. wish would have thought of in season.. but didnt... just found this site..
will try this buy running and heating up slave and test that way..
plans at this point.. have to change stator,,,,AGAIN.. used after market ones.. now Honda released a new one to address issue.. so plan in a month to pull motor again.. going to replace with MAC exhaust and KN air filter.. since will ad power and old pipes rusted... do both at same time since have to re-jet

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Re: clutch slave cylinder keeps building up pressure

Postby flash1942 » Wed Mar 11, 2015 9:10 am

I was not aware that Honda was still supporting the old wings !!! What is that all about?

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Re: clutch slave cylinder keeps building up pressure

Postby deanbw » Wed Mar 11, 2015 2:22 pm

Just a thought....don't use brake fluid you have had for a while. It absorbs moisture. I see you have had lots of good ideas but I didn't see this brought up. sorry if I missed it.

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virgilmobile
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Re: clutch slave cylinder keeps building up pressure

Postby virgilmobile » Wed Mar 11, 2015 2:40 pm

Yes Its a good idea to always use new dot4 when doing any service.As normal service,I flush my "hydraulic system" completly out with new dot4 every 2 years.

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Re: clutch slave cylinder keeps building up pressure

Postby WingAdmin » Wed Mar 11, 2015 6:37 pm

The other thing that can cause this is a collapsed hydraulic line. The inside of the hose swells shut. When you squeeze the lever, there's enough pressure to push past the obstruction, but the return spring doesn't have enough power to push the fluid back.

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Re: clutch slave cylinder keeps building up pressure

Postby virgilmobile » Wed Mar 11, 2015 6:45 pm

True..if his replacement line has the same problem as the original.
Its possible.
The reason to loosen the banjo the next time.

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Re: clutch slave cylinder keeps building up pressure

Postby dlddpt » Mon Apr 27, 2015 9:35 am

Finally fixed problem... had stainless steel braided line made... found a place in England.. put it on yesterday and solved problem.. which was old rubber line... pass the word around

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Re: clutch slave cylinder keeps building up pressure

Postby WingAdmin » Mon Apr 27, 2015 2:14 pm

dlddpt wrote:Finally fixed problem... had stainless steel braided line made... found a place in England.. put it on yesterday and solved problem.. which was old rubber line... pass the word around


Yeah, the old rubber lines after many years of service will begin to swell inside, to the point that they close up. When you squeeze the clutch lever, you provide tons of pressure that squirts fluid through down to the slave cylinder. However, when you let go of the lever, the return spring in the slave cylinder doesn't have the same force that your hand does on the lever, so it doesn't exert enough pressure to get the fluid back through the swollen, obstructed rubber line. The end result is exactly what you experienced.

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Re: clutch slave cylinder keeps building up pressure

Postby Yatesfly » Mon May 04, 2015 6:42 am

I had similar problem with a venture it was the small vent plugged then last fall I had the same thing with my front brakes on my 82 gl500 the hole was not plugged solid but I did clean it out but I had a brake line collapsing Honda said they had them but they were not available found a guy in California that sold me all 3 lines for the gl500 for about 87 dollars he had specs for most bikes. Honda did have a brake reservoir for the gl500 that was a surprise.

dlddpt
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Re: clutch slave cylinder keeps building up pressure

Postby dlddpt » Mon May 04, 2015 9:09 am

Problem is fixed... put around 200 miles on it over the weekend... no slippage and was getting on it hard... stainless steel braided line is best way to go..

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Re: clutch slave cylinder keeps building up pressure

Postby creedfire » Mon May 04, 2015 11:08 am

yatesfly-can you get me contact for your replacement lines?

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Re: clutch slave cylinder keeps building up pressure

Postby dlddpt » Mon May 04, 2015 12:32 pm

davidgoodlip@googlemail.com
and feel free to pass to others who might need it
he made it 4 inches longer since was made in one piece and no hard line.. worked great
tell him that got info from Don

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Re: clutch slave cylinder keeps building up pressure

Postby Yatesfly » Mon May 04, 2015 3:05 pm

I amm not at home for another week the guy in cal. Hade a name like cde enterprises or something I found it on one of these list. He made lines for bikes and hot rods and they are stainless but I got mine with a extra black cover (less conspicuous ) I will look around this evening and see if I can come up with the info.

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Re: clutch slave cylinder keeps building up pressure

Postby Yatesfly » Mon May 04, 2015 3:32 pm

I found it. (http://www.jdaent.com) or call 530-365-8400 the company has changed hands but people are still using them their lines are dot approved I hear. Last year they had specs for my lines but at worse you might send them your old lines . Mine came exactly same length as old ones the banjo fitting are a little thinner than the Honda ones but he included extra washers. I don't remember for sure but think the problem was on the splitter on the fork anyway it worked out for me. The ends also had the right bends but I had my old ones to compare to. My advice would be to call them they were easy to talk to and very knowledgable seems they did a lot of bikes and custom hot rods and maybe NASCAR type stuff. So give them a call and you decide. By the way this info came from the cx and gl 500 forum.

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Re: clutch slave cylinder keeps building up pressure

Postby bellboy40 » Mon May 04, 2015 3:37 pm

Check out this website. They make stainless lines in the US.
http://www.helperformance.us/




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