slave cylinder piston
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slave cylinder piston
Hey y'all... I'm trying to diagnose a no clutch pressure situation but when I remove my slave cylinder, the piston is all the way up against the back of the cylinder and doesn't seem to want to move... is there anyway to get the piston out or since it's stuck in there does that mean that it's bad and I just need to change the whole cylinder?
Thanks!
Thanks!
- hillsy v2
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Re: slave cylinder piston
Compressed air should move it. Be careful of the piston flying out across the garage - best wrap it in a shop rag before you pull the trigger. Alternatively you can use a grease gun to pump it out but that can be messier.1lowcountry wrote: ↑Thu Mar 23, 2023 8:43 pmHey y'all... I'm trying to diagnose a no clutch pressure situation but when I remove my slave cylinder, the piston is all the way up against the back of the cylinder and doesn't seem to want to move... is there anyway to get the piston out or since it's stuck in there does that mean that it's bad and I just need to change the whole cylinder?
Thanks!
But first off - have you flushed and bled the system? Might just be full of air.
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Re: slave cylinder piston
Given that the Clutch Hydraulic Line at the Slave Cylinder is Metal, and you know the Piston is all the way back inside the Slave Cylinder, I'd say it seems you have drained Fluid to find this out.1lowcountry wrote: ↑Thu Mar 23, 2023 8:43 pmHey y'all... I'm trying to diagnose a no clutch pressure situation but when I remove my slave cylinder, the piston is all the way up against the back of the cylinder and doesn't seem to want to move... is there anyway to get the piston out or since it's stuck in there does that mean that it's bad and I just need to change the whole cylinder? Thanks!
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Could you please tell us a little of the History of how you came to find this problem and what the symptoms were?
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Re: slave cylinder piston
It's probable that the steel line has cracked allowing the fluid to drain.
Grow old disgracefully young man.
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Re: slave cylinder piston
This ^^^hillsy v2 wrote: ↑Thu Mar 23, 2023 9:32 pmCompressed air should move it. Be careful of the piston flying out across the garage - best wrap it in a shop rag before you pull the trigger. Alternatively you can use a grease gun to pump it out but that can be messier.1lowcountry wrote: ↑Thu Mar 23, 2023 8:43 pmHey y'all... I'm trying to diagnose a no clutch pressure situation but when I remove my slave cylinder, the piston is all the way up against the back of the cylinder and doesn't seem to want to move... is there anyway to get the piston out or since it's stuck in there does that mean that it's bad and I just need to change the whole cylinder?
Thanks!
But first off - have you flushed and bled the system? Might just be full of air.
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Re: slave cylinder piston
If the piston won't move you can't do anything to the system.
If the piston is stuck all the way in the only thing you can do is get it out and find out wy it is stuck. Bad return spring or build up in the cylinder that won't let it return.
compressed air or find a way to push it out. Some of the older cars with single stage master you could push the piston out with a small rod through the outlet hole.
If the piston is stuck all the way in the only thing you can do is get it out and find out wy it is stuck. Bad return spring or build up in the cylinder that won't let it return.
compressed air or find a way to push it out. Some of the older cars with single stage master you could push the piston out with a small rod through the outlet hole.
I can't seem to win the lottery. I think I have used up all of my good luck riding motorcycles.
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Re: slave cylinder piston
Thanks for the suggestions. As to the case, the bike had no pressure in the clutch when I bought it so I'm not sure how or why it developed that condition. There was fluid in the master cylinder -- low but covering the holes in the bottom. The fluid was clouded so I suspected it may have gotten water or rust in it... anyway I flushed the fluid and did a quick bleed at the slave cylinder through the bleeder and the banjo port. Still didn't have any pressure so I pulled the slave just to do a visual. That's when I noticed that the piston was all the way at the back and not moving. I imagine if I fixed the no pressure issue, that would force the piston forward, but in the meantime I'm replacing the upper section of the hydraulic hose because it looked to be in bad shape and the master cylinder because, why not and it's cheap. I won't be able to test until next week, but I'm going to swap out a slave from an 800 intruder and try y'alls suggestions for getting the piston out. There's probably definitely build-up in the cylinder.
Much appreciated.
Much appreciated.
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Re: slave cylinder piston
Thank you for this Historical info, it helps alot!1lowcountry wrote: ↑Fri Mar 24, 2023 1:59 pmThanks for the suggestions. As to the case, the bike had no pressure in the clutch when I bought it so I'm not sure how or why it developed that condition. There was fluid in the master cylinder -- low but covering the holes in the bottom. The fluid was clouded so I suspected it may have gotten water or rust in it... anyway I flushed the fluid and did a quick bleed at the slave cylinder through the bleeder and the banjo port. Still didn't have any pressure so I pulled the slave just to do a visual. That's when I noticed that the piston was all the way at the back and not moving. I imagine if I fixed the no pressure issue, that would force the piston forward, but in the meantime I'm replacing the upper section of the hydraulic hose because it looked to be in bad shape and the master cylinder because, why not and it's cheap. I won't be able to test until next week, but I'm going to swap out a slave from an 800 intruder and try y'alls suggestions for getting the piston out. There's probably definitely build-up in the cylinder. Much appreciated.
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As my Grandad told me....,..."be wary of the man who has the solution, before he understands the problem".
Since we are talking the Whole System,...When you say you didn't have any pressure in the System after you Flush/Bled it, was that conclusion drawn because the Slave Piston didn't move?
Because it seems it has been sitting for a while in Bad Fluid, would you perform a Pressure Test of the Master Cylinder alone to see if it is working as it should?
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- hillsy v2
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Re: slave cylinder piston
Grandad also knows that if the MC is working and there's ABSOLUTELY NO AIR in the line the slave will pop out regardless.
But sounds like you're about to do the best thing by redoing the whole system to avoid chasing your tail.
But sounds like you're about to do the best thing by redoing the whole system to avoid chasing your tail.
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Re: slave cylinder piston
Thanks again y'all.
I was able to get the piston out the cylinder by just tapping on the back of the cylinder with a hammer... the vibrations seemed to be enough to shake it loose. Cleaned it up with light sanding...piston and seal and spring still looked good but I guess I'll know for sure when Iget the hose replacement next week.
Local bike shop is making one for me because the OEM is $300 apparently.
And right now I just got a new master cylinder clutch and brake set in the mail so I'm going to throw those on and should be good to go after that.
I was able to get the piston out the cylinder by just tapping on the back of the cylinder with a hammer... the vibrations seemed to be enough to shake it loose. Cleaned it up with light sanding...piston and seal and spring still looked good but I guess I'll know for sure when Iget the hose replacement next week.
Local bike shop is making one for me because the OEM is $300 apparently.
And right now I just got a new master cylinder clutch and brake set in the mail so I'm going to throw those on and should be good to go after that.
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Re: slave cylinder piston
More good news!1lowcountry wrote: ↑Sat Mar 25, 2023 1:20 pmThanks again y'all.I was able to get the piston out the cylinder by just tapping on the back of the cylinder with a hammer... the vibrations seemed to be enough to shake it loose. Cleaned it up with light sanding...piston and seal and spring still looked good but I guess I'll know for sure when I get the hose replacement next week.
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Ooo-WEE!1lowcountry wrote: ↑Sat Mar 25, 2023 1:20 pm..........Local bike shop is making one for me because the OEM is $300 apparently.
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I went with Braided Stainless Steel Lines from BSR Aerotek.
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They had several colors of Lines, and I liked lightly Smoked look and Chromed Fittings....all make up in my Shop to exact length,.... no Too-long Sagging nor Too-short Tightness/Binding.
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Wise Move.1lowcountry wrote: ↑Sat Mar 25, 2023 1:20 pm.........And right now I just got a new master cylinder clutch and brake set in the mail so I'm going to throw those on and should be good to go after that.
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- hillsy v2
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Re: slave cylinder piston
If the piston popped out after you hit the slave with a hammer I'd say the seal is stuffed. They shouldn't fall out like that.
New seal is cheap - you're pretty much getting new everything else so do the lot IMO.
New seal is cheap - you're pretty much getting new everything else so do the lot IMO.
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Re: slave cylinder piston
- hillsy v2
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Re: slave cylinder piston
You didn't say that initially - you added it in after you posted.
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Re: slave cylinder piston
Got everything put on and bled the system... thought I could gravity bleed but after an hour of finnegaling just went and got a vaccum bleeder from the Advanced Autos. The seal looked good and snug but I might just go ahead and replace like y'all suggested.
I'm not sure which way I sanded... it was a pretty light sanding just to get off the gunk and corrosion... hopefully I didn't create more problems...
Thanks again y'all
I'm not sure which way I sanded... it was a pretty light sanding just to get off the gunk and corrosion... hopefully I didn't create more problems...
Thanks again y'all
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Re: slave cylinder piston
Very Good!1lowcountry wrote: ↑Mon Apr 03, 2023 8:51 amGot everything put on and bled the system... thought I could gravity bleed but after an hour of finnegaling just went and got a vaccum bleeder from the Advanced Autos. The seal looked good and snug but I might just go ahead and replace like y'all suggested.
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If it's not leaking, most probably not.1lowcountry wrote: ↑Mon Apr 03, 2023 8:51 amI'm not sure which way I sanded... it was a pretty light sanding just to get off the gunk and corrosion... hopefully I didn't create more problems...
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You are Welcome
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