Bad Slave Cylinder???? I'm Feeling Nauseous!!
06-06-2008, 03:57 PM
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Bad Slave Cylinder???? I'm Feeling Nauseous!! Installing new LS7 Package with new Clutch, Flywheel, Pressure Plate, Slave Cylinder (GM stock 2001 and up), Rear Main Seal, etc.....
Finally get around to bleeding, give it a pump, release, pump, release, pump, release,
and...
Brake fluid dumps onto the ground from the bottom hole of the bellhousing.
No success at bleeding after that. Fluid continues leaking.
Did I omit a spacer?? is there supposed to be a shim there?? If so, has the seal blown out of the slave??
Could the NEW Slave been mishandled before installing???
Anything else??
What happened????
Working on the ground , not excited about the prospect of removing Trans again.
Finally get around to bleeding, give it a pump, release, pump, release, pump, release,
and...
Brake fluid dumps onto the ground from the bottom hole of the bellhousing.
No success at bleeding after that. Fluid continues leaking.
Did I omit a spacer?? is there supposed to be a shim there?? If so, has the seal blown out of the slave??
Could the NEW Slave been mishandled before installing???
Anything else??
What happened????
Working on the ground , not excited about the prospect of removing Trans again.
Last edited by danf1000; 06-06-2008 at 04:04 PM.
06-06-2008, 04:32 PM
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Double check the line where it connects to the slave. I actually had one come loose at the track one night. Loaded the car up, took it home and put it on jacks. Was under the car with my 15 and 13 mil sockets about to remove the trans to replace the slave when I reached up and grabbed the line. Gave it a little push and voila... It was the first time at the track since the trans had been out. Hopefully yours will be this easy.
06-06-2008, 04:57 PM
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There' is simply no fluid coming out at that connection. The connection peeks itself out of the bellhousing enough to direct leaking out so that you can see it. No evidence of leaking at the connection. Certainly at the volume of leakage there would have been a tell-tale.
Is there some Slave/Throwout Bearing preparation steps that I could have missed??
Is there some Slave/Throwout Bearing preparation steps that I could have missed??
06-06-2008, 05:23 PM
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Pics of old slave:
1)Connection attached to aluminum body with a roll pin/o-ring
2)Another view
3)Silver ring between body and gulde the hydraulically forced floating component???
1)Connection attached to aluminum body with a roll pin/o-ring
2)Another view
3)Silver ring between body and gulde the hydraulically forced floating component???
06-06-2008, 05:32 PM
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When it happened on my car, there was very little, if any fluid at the line. The reservior emptied in no time and the fluid came out the bottom of the bell. Not saying this is the problem, but it would be nice if it were.
There isn't too much you could do to a new slave. No prep work involved. I have heard of people "deadheading" them when they install 'em. Never seen it myself but they can crack if they are full and the fluid has nowhere to go. You might search for deadheading cuz I don't know much about it...
You didn't remove tthe quick connect from the slave or anything like that did you?
There isn't too much you could do to a new slave. No prep work involved. I have heard of people "deadheading" them when they install 'em. Never seen it myself but they can crack if they are full and the fluid has nowhere to go. You might search for deadheading cuz I don't know much about it...
You didn't remove tthe quick connect from the slave or anything like that did you?
06-06-2008, 06:02 PM
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No change on reconnect/rebleed. Steady 1/16 inch fluid drain after bleeding a couple times.
Any suggestions out there?? Any thoughts on design/failure based on pictures above??
Any suggestions out there?? Any thoughts on design/failure based on pictures above??
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06-06-2008, 06:59 PM
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Chuck:
That makes sense but what if the slave was new and had no fluid in it?? Surely the air pressure alone would have had no chance to break it??
I connected late.
WOW. It has to happen to me.
That makes sense but what if the slave was new and had no fluid in it?? Surely the air pressure alone would have had no chance to break it??
I connected late.
WOW. It has to happen to me.
06-06-2008, 07:10 PM
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Correct. An empty slave should not be a problem. Is it a GM slave? I've heard that they are all the same but who knows? It does sound like you may have a bad slave. Sure do wish it would have been the easy fix. Still might be something else...
06-06-2008, 07:43 PM
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misalignment??
Take a look at this:
https://ls1tech.com/forums/showthrea...linder+cracked
Pulling it out tomorrow!!
Take a look at this:
https://ls1tech.com/forums/showthrea...linder+cracked
Pulling it out tomorrow!!
06-06-2008, 07:43 PM
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Hate to say but, if the line is secure, the bleeder and quick connect are installed correctly and fluid is coming out the slit in the bell, you probably have a cracked/bad slave. The silver lining, (if you want one), is the more times you pull the trans, the easier it becomes. Ask me how I know...
I think the misalignment would only be a problem if you drove the car. But anything is possible. Sometimes I really miss the old mechanical clutches...
I think the misalignment would only be a problem if you drove the car. But anything is possible. Sometimes I really miss the old mechanical clutches...
Last edited by chuckyt1; 06-06-2008 at 07:48 PM.
06-06-2008, 09:00 PM
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I'm thinking that a machinist rule and a good set of Verniers would tell the tale of misalignment. All the bolt holes lined up ok, there might have been a growth of some sort that could be the problem, axially with the car, or maybe non-flat surfaces.
Anyway, it looks like both failures resulted in the same type of fracture in the Slave casting. If I can address both issues, as well as others, maybe I can find (or eliminate) the potential problems before I do the same thing over again.
Anyway, it looks like both failures resulted in the same type of fracture in the Slave casting. If I can address both issues, as well as others, maybe I can find (or eliminate) the potential problems before I do the same thing over again.
06-07-2008, 09:55 AM
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Latest News:
Removed Driveshaft, Crossmember, Exhaust Support, Torque Arm, Transmission Mount, Torque Arm Bushing, Transmission, etc.......................
No apparent cracks, imperfections on Slave. I am gonna try to test it by putting weight on it and applying hydraulic pressure. Wish me luck. If I get it to operate leak-free, I will install it without disconnecting.
Removed Driveshaft, Crossmember, Exhaust Support, Torque Arm, Transmission Mount, Torque Arm Bushing, Transmission, etc.......................
No apparent cracks, imperfections on Slave. I am gonna try to test it by putting weight on it and applying hydraulic pressure. Wish me luck. If I get it to operate leak-free, I will install it without disconnecting.
06-08-2008, 05:34 PM
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The "deadheading" 6 speed inc was referring to is the fact that if the slave has fluid in it and the tranny is tightened up without the slave line connected:
The slave will be compressed by the bellhousing bolts pulling the assembly together, and since a liquid is basically incompressible it busts the slave housing then spews out to the floor.
When you do it again be certain to open the bleeder. Just leave it open until you connect the line and bleed it after the install.
Never had this issue myself but that is what I get from it.
The slave will be compressed by the bellhousing bolts pulling the assembly together, and since a liquid is basically incompressible it busts the slave housing then spews out to the floor.
When you do it again be certain to open the bleeder. Just leave it open until you connect the line and bleed it after the install.
Never had this issue myself but that is what I get from it.
06-16-2008, 07:36 PM
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All finished with install. LS7 clutch engages smoothly but a little early on the travel.
2nd slave bled with no problem, getting money back on the 1st one. Thanks, GM supplier..................................
2nd slave bled with no problem, getting money back on the 1st one. Thanks, GM supplier..................................
06-18-2008, 02:45 PM
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No clue. I think it corroded and froze up over the course of the 4 months it sit waiting to be installed.
Again, it was high on pressure as the bleeding process was started the first time. When hydraulic incompressibility vs. a locked mechanism met, the seal blew out. When it happened it was dramatic. Fluid burst out.
Again, it was high on pressure as the bleeding process was started the first time. When hydraulic incompressibility vs. a locked mechanism met, the seal blew out. When it happened it was dramatic. Fluid burst out.